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Fosi Audio Fosi Audio ZA3

Fosi Audio ZA3 is a balanced Class D power amplifier that operates in stereo or high-power mono mode.Its TPA3255 platform, XLR/TRS and RCA inputs, active-subwoofer output and scalable architecture make it a flexible foundation for compact HiFi systems.Why it stands outFour reasons this product deserves a place in a well-planned audio system.Stereo or Mono OperationUse one ZA3 for a conventional stereo system or two units in mono mode for a scalable dual-mono installation.Balanced XLR/TRS InputThe combo balanced input helps reject interference and integrates with balanced DACs and preamplifiers.Active Subwoofer OutputA dedicated line-level output simplifies adding a powered subwoofer to a stereo system.Replaceable Op-AmpsSocketed op-amps let experienced users experiment with compatible DIP8 dual op-amps.Best for Balanced DAC and preamp systems Stereo passive-speaker systems Dual-mono amplifier upgrades 2.1 systems using a powered subwoofer Installations using 12V trigger control Not ideal for Users expecting Bluetooth, USB or digital inputs Buyers needing a headphone output Passive subwoofers without their own amplifier Buyers who have not checked whether their variant includes a power adapter EMiUZEK Buying Notes ZA3 is a power amplifier and requires an external source or preamp with suitable volume control. The subwoofer output is line level and is only for a powered subwoofer. Check the selected variant: amplifier-only, 32V/5A and 48V/5A power options are listed separately. Frequently Asked QuestionsCan one ZA3 power a stereo pair?Yes. Use stereo mode to power left and right passive speakers from one unit.When are two ZA3 amplifiers required?Use two units when building a dual-mono stereo system, with one amplifier assigned to each channel.Can it connect to an XLR source?Yes. The balanced combo input supports XLR and 1/4-inch TRS connections.Can it power a passive subwoofer?No. Its subwoofer output is line level and requires a powered subwoofer.Does it include Bluetooth or a DAC?No. Connect an external DAC, streamer or preamplifier through RCA or balanced input.Does every option include a power supply?No. Verify the selected product variant before ordering.HOW TO CONNECTBalanced stereo systemSource: Balanced DAC or preampConnection: XLR / 1/4-inch TRSOutput: Speaker terminalsTarget: Passive speaker pairNote: Set ZA3 to stereo mode.Dual-mono systemSource: Balanced DAC or preampConnection: One balanced channel to each ZA3Output: Speaker terminal in mono configurationTarget: One passive speaker per amplifierNote: Use two ZA3 units and set both to mono mode.2.1 stereo systemSource: DAC / preampConnection: RCA or balanced inputOutput: Speaker outputs plus sub-outTarget: Passive speakers and powered subwooferNote: Do not connect a passive subwoofer to sub-out.Technical SpecificationsAmplifier Feature Specification Product Type Stereo/mono Class D power amplifier Amplifier Chip Texas Instruments TPA3255 Speaker Impedance 2–8Ω Modes Stereo / PBTL mono Performance Feature Specification Rated Output with 48V/5A 155W x2 at 4Ω stereo; 235W x1 at 4Ω mono Rated Output with 32V/5A 95W x2 at 4Ω stereo; 110W x1 at 4Ω mono Frequency Response 20Hz–20kHz (±0.1dB) SINAD 89dB SNR ≥106dB THD <0.006% Dynamic Range ≥106dB Connectivity and Power Feature Specification Inputs RCA; XLR / 1/4-inch TRS balanced combo Outputs Passive speakers; active subwoofer line output Trigger 12V trigger input DC Input Range 24–48V Power Options 32V/5A or 48V/5A; variant dependent Recommended System Setup Setup Connection Stereo HiFi DAC/preamp → ZA3 stereo mode → passive speaker pair Dual mono Balanced preamp → two ZA3 units → passive speaker pair 2.1 system Source/preamp → ZA3 → passive speakers + powered subwoofer Additional Product Content Feature ZA3 V3 Mono TB10D Amplifier Format Stereo / mono selectable Monoblock Stereo Amplifier Chip TPA3255 TPA3255 TPA3255 Inputs XLR/TRS, RCA XLR, RCA RCA Stereo from One Unit Yes No Yes Mono Mode Yes Always mono No Active Subwoofer Output Yes No No 12V Trigger Input No No Tone Controls No No Bass, treble Op-Amp Rolling Yes Yes No Best Use Flexible balanced stereo/mono Dedicated monoblocks Simple adjustable stereo

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$109.99 - $149.99

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Fosi Audio Fosi Audio Music Rhythm Visualizer Light

Fosi Audio Music Rhythm Visualizer Light is a USB-C powered ambient LED display that reacts to nearby music through its built-in microphone.Its 32 RGB LEDs, adjustable effects and compact aluminum housing add synchronized visual movement to a desktop, gaming or HiFi setup without entering the audio signal path.Why it stands outReal-time music responseA built-in microphone converts nearby rhythm and level changes into synchronized LED movement.32 RGB LED displayMultiple colors and dynamic effects create a more expressive visual response than a static ambient light.Adjustable presentationOn-device controls allow quick changes to mode, color and sensitivity.Simple USB-C powerThe compact aluminum light can be powered from a suitable USB source without connecting to audio equipment.Best for Desktop HiFi systems Gaming and computer setups Listening-room ambient lighting Users wanting sound-reactive visuals without changing the audio chain Not ideal for Users needing an audio spectrum measurement instrument Outdoor or wet-location lighting Users expecting the light to transmit or process audio EMiUZEK Buying Notes The visualizer reacts through a microphone and does not need an audio input cable. USB-C supplies power only; the light is not a DAC, amplifier or music source. Performance depends on room volume, distance and sensitivity setting. Frequently asked questionsDoes it connect to the audio output?No. It listens through its built-in microphone and does not enter the audio signal path.What does USB-C do?USB-C supplies power to the visualizer.Can I adjust the lighting?Yes. Use the controls to change the mode, color and sensitivity.Will it work with speakers and headphones?It responds best to audible room sound. Headphone-only playback may not provide enough sound for the microphone.Does it improve sound quality?No. It is a visual accessory and does not process audio.Is it a professional spectrum analyzer?No. It is an entertainment light designed for responsive visual effects.HOW TO CONNECTDesktop audio setupSource: Computer or streamer playing through speakersConnection: USB-C power; sound detected by microphoneOutput: RGB light displayTarget: Visualizer placed near the speakersNote: Adjust sensitivity to suit the listening level.HiFi listening roomSource: Amplifier and speaker systemConnection: USB-C power; ambient sound detectionOutput: RGB light displayTarget: Visualizer on a shelf or equipment rackNote: Keep the microphone unobstructed.Gaming setupSource: PC or console with speakersConnection: USB-C power; ambient sound detectionOutput: RGB light displayTarget: Visualizer near the display or speakersNote: Choose a lower sensitivity if effects remain constantly active.Technical SpecificationsCore specifications Feature Specification Product type Sound-reactive ambient LED visualizer LED array 32 RGB LEDs Sound detection Built-in microphone Processing 32-bit ARM processor with automatic gain control Housing Aluminum alloy Controls and power Feature Specification Power input USB-C Adjustments Display mode, color, speed and sensitivity Audio connection Not required Recommended System Setup Setup Connection Desktop system USB power → Visualizer placed near speakers Gaming system USB power → Visualizer beside display HiFi system USB power → Visualizer on equipment rack

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$59.00

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Fosi Audio Fosi Audio P4

Fosi Audio P4 is a compact solid-state stereo preamplifier that brings three RCA sources under one volume and tone-control stage.Its motorized analog volume control, remote operation, three-level gain, tone bypass and separate pre-out make it a practical partner for power amplifiers and powered subwoofers.Why it stands outThree-source analog hubThree RCA inputs allow convenient switching among a DAC, streamer, CD player or other line-level source.Motorized analog volume controlThe remote-driven analog potentiometer provides smooth level adjustment without replacing the analog signal path with digital volume control.Flexible tone and gain adjustmentBass, treble, bypass and three gain levels help match different source levels and listening preferences.Low-noise preamplifier performanceHigh SNR and low THD+N support clean system control in a compact all-metal chassis.Best for Systems with multiple line-level analog sources Power amplifiers needing source selection and remote volume Powered speaker systems 2.1 systems using the volume-controlled pre-out Not ideal for Driving passive speakers directly Turntables without a built-in or external phono preamp Users needing Bluetooth or digital audio inputs EMiUZEK Buying Notes P4 is a preamplifier and cannot directly power passive speakers. All three inputs are line-level RCA; a standard turntable requires a phono preamp. Pre-out is volume controlled and suitable for compatible powered subwoofers or powered speakers. Frequently asked questionsCan P4 drive passive speakers?No. Connect its RCA output to a power amplifier that drives the passive speakers.Does P4 include Bluetooth?No. It is an analog RCA preamplifier.Can I connect a turntable?Only if the turntable has a built-in phono stage or you use an external phono preamp.What is pre-out for?It provides a volume-controlled line-level output for compatible powered speakers, a powered subwoofer or downstream equipment.Can tone controls be bypassed?Yes. The bypass function provides a more direct signal path when tone adjustment is not needed.What does the gain setting do?The three gain levels help match differing source output levels and system sensitivity.HOW TO CONNECTPower amplifier systemSource: DAC, streamer, CD player or phono preampConnection: RCA inputOutput: RCA outputTarget: Power amplifier → passive speakersNote: Select the source and use P4 for volume control.Powered speaker systemSource: Up to three line-level sourcesConnection: RCA inputOutput: Pre-out or RCA outputTarget: Powered speakersNote: Begin with conservative volume settings on both devices.2.1 systemSource: Line-level sourceConnection: RCA inputOutput: RCA output + pre-outTarget: Power amplifier and powered subwooferNote: Use pre-out for the powered subwoofer and confirm crossover settings.Technical SpecificationsAudio performance Feature Specification Product type 2.0-channel solid-state preamplifier SNR ≥110dB Dynamic range ≥110dB THD+N ≤0.003% Crosstalk ≥105dB Noise floor ≤9μV Frequency response 20Hz–20kHz (±0.1dB) Tone adjustment ±12dB Connectivity and power Feature Specification Inputs RCA × 3 Outputs RCA, pre-out Gain adjustment +3dB / +6dB / +9dB Volume control Motorized analog potentiometer with remote Power supply DC 12V / 1.5A Recommended System Setup Setup Connection Stereo separates Sources → P4 → Power amplifier → Passive speakers Powered speakers Sources → P4 → Powered speakers 2.1 separates Sources → P4 → Power amplifier + powered subwoofer Additional Product ContentFosi Audio product comparisonCompare the main Fosi Audio preamplifier choices by source support, outputs and the features that most affect system design. Feature P4 P3 ZP3 Product position Compact analog preamp Tube preamp + headphone amp Balanced high-performance preamp Analog inputs RCA × 3 RCA RCA × 2, XLR Wireless / digital inputs None Bluetooth 5.1 None Main outputs RCA, pre-out RCA, AUX RCA, XLR, sub-out Headphone output No 3.5mm No Speaker amplification No No No Tube stage No Yes, replaceable 5654W No Tone controls Bass and treble with bypass Bass and treble Bass and treble Remote control Yes No Yes THD+N ≤0.003% ≤0.02% ≤0.0007% SNR ≥110dB ≥103dB ≥115dB Best use Three analog sources and powered sub expansion Bluetooth tube preamp and headphones Balanced stereo system integration

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$119.00

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Fosi Audio Fosi Audio IM4

Fosi Audio IM4 is an open-back wired in-ear monitor built around a 10mm dual-magnet dynamic driver.Its lightweight CNC-aluminum shells, replaceable nozzles and multiple ear-tip tunings combine a spacious presentation with adjustable comfort and sound.Why it stands outOpen-back acoustic designReduces enclosed-ear pressure and creates a more spacious presentation than a sealed IEM.10mm dual-magnet driverAn N52 dual-magnet, dual-chamber dynamic driver delivers the full frequency range.Tunable fit and soundTwo nozzle materials and three ear-tip styles allow practical adjustment.Lightweight detachable constructionEach aluminum earpiece weighs about 7g and uses a replaceable 0.78mm 2-pin cable.Best for Home and office wired listening Listeners who prefer an open, spacious IEM Long listening sessions Users wanting replaceable cables and tuning accessories Not ideal for Maximum passive noise isolation Wireless Bluetooth listening without an adapter Very quiet public environments where sound leakage matters EMiUZEK Buying Notes IM4 is open-back, so it isolates less and can leak more sound than a sealed IEM. The standard package uses a 3.5mm cable; balanced cables and DS3 bundles depend on the selected variant. Choose ear tips for both seal and comfort, then compare nozzles at a safe volume. Frequently asked questionsIs IM4 open-back?Yes. It is designed for a more open presentation with reduced isolation.Does it include Bluetooth?No. It is a passive wired IEM.Can the cable be replaced?Yes, it uses a 0.78mm 2-pin detachable connection.Is a 4.4mm cable included?Only with the relevant option or bundle; check the selected variant.Can it be used with a phone?Yes, when the phone has a compatible output or USB DAC adapter.Does the DS3 always come in the box?No. DS3 is included only in specifically named combo variants.HOW TO CONNECTPhone listeningSource icon: phoneSource: Phone / tabletConnection: 3.5mm output or compatible USB DACOutput connection: 0.78mm 2-pin cableTarget icon: headphonesOutput: IM4 earphonesPortable DAC systemSource icon: phoneSource: USB-C phone / playerConnection: USB DAC to 3.5mm or optional 4.4mm cableOutput connection: Detachable cableTarget icon: headphonesOutput: IM4 earphonesDesktop listeningSource icon: computerSource: PC / desktop DACConnection: 3.5mm or compatible balanced headphone outputOutput connection: Detachable cableTarget icon: headphonesOutput: IM4 earphonesTechnical SpecificationsAcoustic design Feature Specification Driver 10mm N52 dual-magnet dual-cavity dynamic driver Diaphragm PU beryllium-coated Design Open-back in-ear monitor Impedance 21Ω Sensitivity 109dB Frequency response 20Hz–20kHz Construction and cable Feature Specification Shell 6063 CNC aluminum alloy Connector 0.78mm 2-pin Standard plug 3.5mm gold-plated Cable 4-core 392-strand 5N OFC silver-plated copper Weight 7g ±0.5g per earpiece; 38g ±1g with cable Additional Product ContentComparison: Which Fosi Audio model is right for you? Model IM4 DS3 + IM4 combo IM4 accessory option Product Open-back wired IEM IM4 with DS3 portable DAC Cable or DAC accessory Standard connection 3.5mm USB-C source through DS3 Depends on selected accessory Best use Direct wired listening Portable DAC and gaming system Upgrading cable or phone connection Important note Standard package only Only named combo variants include DS3 Accessory is not a complete IM4 package

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$29.00 - $239.00

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Fosi Audio Fosi Audio DS3

Fosi Audio DS3 is a portable USB DAC and headphone amplifier designed for music, gaming and multichannel spatial-audio playback.Hardware 7.1 processing, PCM 768kHz/DSD512 decoding and a 220mW output combine immersive gaming modes with high-resolution wired headphone listening.Why it stands outHardware-level 7.1 spatial audioProcesses compatible multichannel game audio into an expansive headphone presentation without PC software.Dedicated gaming sound modesSwitch between standard, FPS and 7.1 spatial effects in UAC 1.0 mode.High-resolution music playbackSupports PCM up to 32-bit/768kHz and native DSD512.Compact high-output designProvides up to 220mW at 32Ω while weighing only 16g.Best for PC and console gaming with wired headphones Portable high-resolution music playback Users wanting selectable spatial-audio effects 16–300Ω wired headphones Not ideal for Bluetooth or wireless playback Headsets requiring microphone passthrough Users wanting speaker amplification EMiUZEK Buying Notes 7.1 spatial processing depends on the source game or device providing compatible multichannel audio. Gaming effects are selected in UAC 1.0 mode; music filters are handled in UAC 2.0 mode. DS3 has no built-in battery and draws power from the connected source. Frequently asked questionsDoes DS3 require a driver?No PC software or driver is required for its core operation.How is 7.1 mode selected?In UAC 1.0 mode, hold both volume buttons to cycle through the available sound effects.Can it play ordinary stereo music?Yes. Spatial effects are optional and standard stereo playback is supported.What is the maximum output power?The official specification lists 220mW at 32Ω.Does it support DSD?Yes, up to native DSD512.Can gain be changed?Yes. Press both volume buttons together to switch between low and high gain.HOW TO CONNECTPC gamingSource icon: computerSource: Gaming PCConnection: USB audio / compatible multichannel outputOutput connection: Headphone outputTarget icon: headphonesOutput: Wired gaming headphonesConsole gamingSource icon: deviceSource: Compatible consoleConnection: USB audio in UAC 1.0 modeOutput connection: Headphone outputTarget icon: headphonesOutput: Wired headphonesPortable musicSource icon: phoneSource: USB-C phone / tabletConnection: USB-C audioOutput connection: Headphone outputTarget icon: headphonesOutput: Wired headphones or IEMsTechnical SpecificationsAudio and processing Feature Specification Product type Portable USB DAC and headphone amplifier Maximum PCM 32-bit / 768kHz DSD Native DSD512 Spatial processing Hardware 7.1; FPS effect; standard mode Output and physical Feature Specification Maximum output 220mW @ 32Ω Recommended impedance 16–300Ω Dimensions 55 × 20 × 11mm Weight 16g Additional Product ContentComparison: Which Fosi Audio model is right for you? Model DS1 DS2 2024 DS3 Primary use Portable Hi-Res music Portable Hi-Res music Music and gaming spatial audio DAC / processing ESS ES9038Q2M Dual CS43131 Hardware 7.1 processing Maximum PCM 32-bit / 768kHz 32-bit / 384kHz 32-bit / 768kHz Maximum DSD DSD512 DSD256 DSD512 Maximum stated output 220mW @ 32Ω balanced 510mW @ 32Ω balanced (manual) 220mW @ 32Ω Best use Compact ESS dongle Higher-power balanced portable setup Gaming effects and spatial audio

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$80.69 - $239.00

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Fosi Audio Fosi Audio ZH3

Fosi Audio ZH3 is an all-in-one desktop DAC, balanced headphone amplifier and preamplifier for headphones, active speakers and external amplifiers.Its AK4493SEQ DAC, powerful 4.4mm balanced output, multiple digital/analog inputs and XLR/RCA pre-outs create a complete desktop HiFi control center.Why it stands outFour reasons this product deserves a place in a well-planned audio system.All-in-One Desktop HubDAC, headphone amplification and preamp functions reduce the need for several separate components.2570mW Balanced Headphone OutputThe 4.4mm output provides substantial power at 32Ω, while three gain levels support a broad range of headphones.High-Resolution AKM PlatformXMOS XU316 and AK4493SEQ support PCM 32-bit/768kHz and DSD512 playback.Flexible System ControlRCA/XLR line outputs, remote control, tone adjustment, six filters and swappable op-amps support system customization.Best for Desktop headphone systems Balanced 4.4mm headphone listening Active studio monitors and powered speakers External power amplifiers requiring preamp control Computer and game-console USB audio Not ideal for Users needing built-in passive-speaker amplification Wireless Bluetooth-only systems TV systems requiring HDMI ARC Portable or battery-powered listening EMiUZEK Buying Notes ZH3 can drive headphones and control active speakers or a power amplifier, but it cannot directly drive passive speakers. Its USB input supports UAC 1.0 and 2.0 modes; choose the compatible mode for computers or game consoles. RCA is an analog input, while RCA and XLR line outputs are intended for downstream active speakers or amplifiers. Frequently Asked QuestionsCan the ZH3 drive passive speakers?No. Use its line outputs with a separate power amplifier, or connect active speakers.Which headphone outputs are included?It provides 4.4mm balanced and 6.35mm single-ended headphone outputs.Does it support Bluetooth?No Bluetooth input is specified. Use USB, optical, coaxial or analog RCA input.Can I connect a game console?Yes. UAC 1.0/2.0 switching supports compatible game-console USB audio configurations.Can it connect to active speakers?Yes. Use RCA or balanced XLR line output and control volume through the ZH3 preamp.Can it accept an analog source?Yes, through RCA analog input.What headphones can it support?The three-level gain system is specified for approximately 16–300Ω headphones; start with low gain and low volume.HOW TO CONNECTComputer headphone systemSource: PC / MacConnection: USBOutput: 4.4mm or 6.35mmTarget: Wired headphonesNote: Choose UAC mode and gain appropriate for the source and headphones.Active speaker systemSource: Computer / digital transport / analog sourceConnection: USB, optical, coaxial or RCAOutput: XLR or RCA line outputTarget: Active speakersNote: Use preamp volume control and begin at a low level.External amplifier systemSource: Digital or analog sourceConnection: USB, optical, coaxial or RCAOutput: XLR or RCA line outputTarget: Power amplifier → passive speakersNote: ZH3 supplies the DAC and preamp stages only.Technical SpecificationsCore Architecture Feature Specification Product Type DAC / balanced headphone amplifier / preamplifier DAC AKM AK4493SEQ USB Interface XMOS XU316 Headphone Amplifiers OPA1612 x4 Maximum Resolution PCM 32-bit/768kHz; DSD512 Inputs and Outputs Feature Specification Inputs USB, optical, coaxial, RCA analog Headphone Outputs 4.4mm balanced; 6.35mm single-ended Line Outputs Balanced XLR; RCA USB Modes UAC 1.0 / UAC 2.0 Trigger 12V trigger connection Headphone Performance Feature Specification 4.4mm Output at 32Ω 2570mW x2 6.35mm Output at 32Ω 640mW x2 Gain Three levels Headphone Impedance Range 16–300Ω Audio Performance Feature Specification SINAD ≥115dB SNR ≥121dB THD+N ≤0.00018% Noise Floor ≤1.9μV Sound Adjustment Bass/treble EQ; six filters; bypass Power Supply DC 12V Recommended System Setup Setup Connection Headphones Computer → USB → ZH3 → 4.4mm/6.35mm headphones Active speakers Source → ZH3 → XLR/RCA active speakers Passive speakers Source → ZH3 → power amplifier → passive speakers Additional Product Content Feature ZH3 ZD3 GR40 Product Position DAC / headphone amp / preamp Balanced DAC / preamp Tube DAC / headphone amp DAC Chip AK4493SEQ ES9039Q2M Not specified USB Maximum PCM 768kHz / DSD512 PCM 768kHz / DSD512 Lower-tier desktop decoding HDMI ARC No Yes No Bluetooth No Yes Yes Analog RCA Input Yes No No Headphone Outputs 4.4mm, 6.35mm None 3.5mm Balanced XLR Output Yes Yes No Headphone Power at 32Ω 2570mW x2 balanced Not applicable 250mW Best Use Complete headphone/desktop hub TV and amplifier DAC hub Compact tube headphone system

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$233.99

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Fosi Audio Fosi Audio SP601

Fosi Audio SP601 is a pair of 6.5-inch passive bookshelf speakers designed for stereo music and home entertainment systems.A silk-dome tweeter, HybridCone composite woofer and 80W RMS power handling provide a balanced upgrade for compact HiFi installations. Why it stands outFour reasons this product deserves a place in a well-planned audio system.Two-Way Driver DesignA 1.5-inch silk-dome tweeter and 6.5-inch composite woofer divide high and low frequencies for clearer stereo reproduction.80W RMS Power HandlingThe pair is rated for 80W RMS and 160W peak power, supporting capable integrated amplifiers without requiring oversized cabinets.Flexible Speaker PlacementFront-facing drivers and tuned bass-reflex construction suit stands, shelves and media-room layouts.Standard Passive IntegrationDual-mode binding posts support common speaker-cable terminations and make the SP601 easy to integrate with a stereo amplifier. Best for Compact stereo music systems Bookshelf or speaker-stand installations TV and home entertainment systems with an external amplifier Listeners upgrading from small entry-level passive speakers Not ideal for Users who need powered speakers with built-in amplification Wireless-only systems without a speaker amplifier Very large rooms requiring high-output floorstanding speakers EMiUZEK Buying Notes SP601 is a passive speaker pair and must be connected to a compatible stereo amplifier. Match the amplifier and listening level to the speakers' 4Ω nominal impedance and 80W RMS rating. Speaker cable is required between the amplifier and each speaker. Frequently Asked QuestionsDo the SP601 speakers include an amplifier?No. They are passive speakers and require an external power or integrated amplifier.What amplifier impedance support is required?Use an amplifier rated to operate safely with 4Ω speakers.Can they connect directly to a television?Only if the television feeds a compatible external amplifier; the speakers cannot accept a TV signal directly.Can I use banana plugs?The dual-mode binding posts are designed for common speaker-cable terminations, including compatible banana plugs.Are they sold as a pair?Yes, the SP601 is supplied as a stereo speaker pair.Do they support Bluetooth or Wi-Fi?Not by themselves. Add a Bluetooth receiver or network streamer through the amplifier if wireless playback is required. HOW TO CONNECTStereo HiFi systemSource: DAC, streamer or CD playerConnection: RCA / digital connection to amplifierOutput: Speaker cableTarget: Stereo amplifier → SP601 pairNote: Observe left/right speaker polarity.TV audio systemSource: TelevisionConnection: HDMI ARC / optical to compatible amplifierOutput: Speaker cableTarget: Amplifier → SP601 pairNote: The amplifier must decode the TV audio signal.Desktop systemSource: Computer / USB DACConnection: Line-level audio to amplifierOutput: Speaker cableTarget: Compact amplifier → SP601 pairNote: Place both speakers at similar height and distance. Technical SpecificationsSpeaker Feature Specification Product Type Two-way passive bookshelf speaker Tweeter 1.5-inch silk dome Woofer 6.5-inch HybridCone composite Nominal Impedance 4Ω Sensitivity 86dB Power Feature Specification RMS Power Handling 80W Peak Power Handling 160W Amplification External amplifier required Connections Feature Specification Speaker Terminals Dual-mode binding posts Wireless Connectivity None Recommended System Setup Setup Connection Stereo music Source → amplifier → SP601 pair TV system TV → AV/stereo amplifier → SP601 pair Desktop HiFi Computer/DAC → compact amplifier → SP601 pair Additional Product ContentNo like-for-like comparison is included because this model has a distinct product role.

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$326.99 - $467.99

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Fosi Audio Fosi Audio GR70

Fosi Audio GR70 is a Class-A tube headphone amplifier and RCA preamplifier for analog desktop and HiFi systems.A two-stage four-tube circuit, dual headphone outputs, selectable impedance modes and tone controls provide warm analog listening for headphones or downstream amplifiers.Why it stands outPure tube amplificationTwo 5654W and two 6Ж4/6Ж8 tubes form a two-stage analog amplification path.Headphone and preamp functionsUse 3.5mm or 6.35mm headphones, or connect the RCA output to powered speakers or a power amplifier.Selectable impedance modesLow and high settings support headphones from 16Ω to 300Ω.Direct analog tone controlFront-panel bass, treble and volume adjustment simplify sound tuning without software.Best for Analog headphone listening High-impedance and conventional full-size headphones Adding tube character before a power amplifier Powered speaker systems with RCA input Not ideal for USB, optical, coaxial or Bluetooth sources without a separate DAC Directly driving passive speakers Balanced headphone or XLR systems EMiUZEK Buying Notes GR70 is an analog headphone amplifier/preamp; digital sources require a DAC with RCA output. Its RCA output cannot power passive speakers directly; use powered speakers or a power amplifier. Use only officially confirmed compatible tubes and allow installed tubes to cool before handling. Frequently asked questionsDoes GR70 include a DAC?No. It accepts analog RCA input.Can it power passive speakers?No. A separate power amplifier is required.Which headphones are supported?The official specification covers 16–300Ω using selectable low/high impedance modes.Does it have balanced output?No. Headphone outputs are 3.5mm and 6.35mm, with RCA pre-output.Can it be used as a preamplifier?Yes, through the rear RCA output.Which tubes are supplied?The official package lists two 5654 tubes and two 6Ж4/6Ж8 tubes.HOW TO CONNECTAnalog headphone systemSource icon: streamerSource: DAC / streamer with RCA outputConnection: RCA line inputOutput connection: 3.5mm or 6.35mm outputTarget icon: headphonesOutput: Wired headphonesPowered speaker systemSource icon: streamerSource: Analog source / DACConnection: RCA line inputOutput connection: RCA pre-outputTarget icon: speakersOutput: Powered speakersSeparate power amplifier systemSource icon: streamerSource: Analog source / DACConnection: RCA line inputOutput connection: RCA pre-outputTarget icon: amplifierOutput: Power amplifier driving passive speakersTechnical SpecificationsAnalog connections Feature Specification Input RCA line input Outputs RCA pre-output; 3.5mm and 6.35mm headphone outputs Amplification Class-A tube Tube complement 2 × 5654W; 2 × 6Ж4/6Ж8 Headphone and power Feature Specification Rated output 90mW @ 32Ω Maximum output 300mW @ 32Ω Headphone impedance Low: 16–120Ω; High: 120–300Ω RCA output level 1.2V SNR ≥97dB Power input DC 12V / 3A Additional Product ContentComparison: Which Fosi Audio model is right for you? Model GR40 GR70 K7 Product position Tube DAC / headphone amp / preamp Analog tube headphone amp / preamp Balanced digital DAC / headphone amp Digital inputs USB, optical, coaxial, Bluetooth None USB, optical, coaxial, Bluetooth Headphone outputs 3.5mm 3.5mm and 6.35mm 3.5mm and 4.4mm balanced Speaker-system output RCA pre-out RCA pre-out RCA line output Best use Digital sources with tube stage Analog tube headphone system High-output HiFi and gaming

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$181.70 - $233.99

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Fosi Audio Fosi Audio DS2

Fosi Audio DS2 (2024) is a portable USB DAC and headphone amplifier for mobile devices and computers.Dual CS43131 DACs, independent volume control and 3.5mm plus 4.4mm outputs deliver clean, powerful wired headphone playback in a compact dongle.Why it stands outDual CS43131 DAC architectureThe current 2024 version uses two Cirrus Logic DAC chips for low-noise conversion.Strong balanced outputThe 4.4mm output provides substantially more power than the single-ended connection.Independent hardware volumeDedicated buttons allow finer adjustment without relying only on the source device.High-resolution playbackSupports PCM up to 32-bit/384kHz and DSD256.Best for USB-C phone and tablet listening Windows and Mac headphone systems Sensitive IEMs and full-size wired headphones Users needing 3.5mm and 4.4mm outputs Not ideal for Bluetooth or wireless headphones Headsets requiring microphone support Users expecting an internal battery EMiUZEK Buying Notes This listing is for the DS2 2024 version with dual CS43131 DACs; older DS2 specifications do not apply. DS2 draws power from the connected source and can feel warm during normal operation. Lightning devices require a compatible Lightning-to-USB-C OTG cable that may be sold separately. Frequently asked questionsWhich DAC chips are used?The current DS2 2024 uses dual CS43131 DACs.What is the maximum resolution?PCM up to 32-bit/384kHz and DSD256.Does it have a battery?No. It is powered by the connected USB device.Can it drive 4.4mm balanced headphones?Yes, with compatible balanced-wired headphones.Can I use a 3.5mm-to-4.4mm adapter?No. Use headphones terminated correctly for the selected output.Why does it feel warm?A moderate temperature rise is normal during high-resolution or higher-output operation.HOW TO CONNECTUSB-C phone listeningSource icon: phoneSource: USB-C phone / tabletConnection: USB-C audioOutput connection: 3.5mm outputTarget icon: headphonesOutput: Wired headphones or IEMsBalanced portable listeningSource icon: phoneSource: USB-C phone / playerConnection: USB-C audioOutput connection: 4.4mm balanced outputTarget icon: headphonesOutput: Balanced headphonesComputer headphone systemSource icon: computerSource: Windows PC / MacConnection: USB audioOutput connection: 3.5mm or 4.4mm outputTarget icon: headphonesOutput: Wired headphonesTechnical SpecificationsAudio architecture Feature Specification Product type Portable USB DAC and headphone amplifier DAC chipset Dual CS43131 Maximum PCM 32-bit / 384kHz DSD DSD64 / 128 / 256 Outputs and performance Feature Specification Headphone outputs 3.5mm single-ended; 4.4mm balanced Output power 128mW @ 32Ω single-ended; 170mW @ 32Ω balanced Recommended impedance 16–300Ω SNR ≥130dB THD+N <0.0002% Additional Product ContentComparison: Which Fosi Audio model is right for you? Model DS1 DS2 2024 DS3 Primary use Portable Hi-Res music Portable Hi-Res music Music and gaming spatial audio DAC / processing ESS ES9038Q2M Dual CS43131 Hardware 7.1 processing Maximum PCM 32-bit / 768kHz 32-bit / 384kHz 32-bit / 768kHz Maximum DSD DSD512 DSD256 DSD512 Maximum stated output 220mW @ 32Ω balanced 510mW @ 32Ω balanced (manual) 220mW @ 32Ω Best use Compact ESS dongle Higher-power balanced portable setup Gaming effects and spatial audio

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$50.29

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Fosi Audio Fosi Audio K5 Pro

Fosi Audio K5 Pro is a compact gaming DAC and headphone amplifier with USB, optical and coaxial digital inputs.A microphone input, RCA output, tone controls and strong 3.5mm headphone amplification provide one control point for PC, console and desktop audio.Why it stands outGaming microphone supportA dedicated 3.5mm microphone input supports compatible PC and console communication setups.Three digital source inputsSwitch between USB-C, optical and coaxial sources.Powerful headphone outputSupports 16–300Ω headphones with up to 500mW at 32Ω.Headphone and speaker integrationUse the 3.5mm headphone output or RCA output for powered speakers and amplifiers.Best for PC and console gaming Desktop headphones and powered speakers TVs with optical PCM output Users wanting physical bass and treble controls Not ideal for High-resolution playback above 24-bit/192kHz Balanced headphone connections Passive speakers without a power amplifier EMiUZEK Buying Notes The microphone function works in USB mode and is not available from optical or coaxial inputs. USB playback is limited to 24-bit/96kHz; optical and coaxial support up to 24-bit/192kHz. K5 Pro does not power passive speakers directly; connect RCA to powered speakers or an amplifier. Frequently asked questionsCan it be used with PS5?Yes, through a compatible USB connection and system audio settings.Does the microphone work with optical input?No. Microphone support is for USB mode.Can it drive 300Ω headphones?Yes, the official recommended range is 16–300Ω.Can it connect to powered speakers?Yes, through RCA output.Does it support balanced headphones?No. The headphone output is 3.5mm single-ended.Can it decode Dolby or DTS from a TV?Use PCM output; multichannel encoded formats are not supported.HOW TO CONNECTPC gamingSource icon: computerSource: PC / MacConnection: USB-C audio + microphoneOutput connection: 3.5mm headphone outputTarget icon: headphonesOutput: Gaming headset / headphonesConsole gamingSource icon: deviceSource: Compatible consoleConnection: USB audioOutput connection: 3.5mm headphone outputTarget icon: headphonesOutput: Gaming headset / headphonesTV and speaker systemSource icon: tvSource: TVConnection: Optical PCMOutput connection: RCA outputTarget icon: speakersOutput: Powered speakers or amplifierTechnical SpecificationsInputs and outputs Feature Specification Inputs USB-C; optical; coaxial; 3.5mm microphone Outputs 3.5mm headphone; RCA line output Recommended headphone impedance 16–300Ω Digital and headphone performance Feature Specification USB maximum 24-bit / 96kHz Optical/coaxial maximum 24-bit / 192kHz Output power 1000mW @ 16Ω; 500mW @ 32Ω; 300mW @ 64Ω; 150mW @ 128Ω; 80mW @ 300Ω SNR ≥110dB THD ≤0.003% Power input DC 5V via USB-C Additional Product ContentComparison: Which Fosi Audio model is right for you? Model K5 Pro Q4 K7 Primary use Gaming DAC with microphone Simple desktop DAC/headphone amp Premium HiFi and gaming DAC Inputs USB, optical, coaxial, microphone USB, optical, coaxial USB, optical, coaxial, Bluetooth, microphone Headphone output 3.5mm 3.5mm 3.5mm and 4.4mm balanced Maximum USB playback 24-bit / 96kHz 24-bit / 96kHz 32-bit / 384kHz; DSD256 Best use Budget gaming communication Basic music and TV upgrade High-output balanced desktop system

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$54.47 - $75.00

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Fosi Audio Fosi Audio SK02

Fosi Audio SK02 is a compact desktop USB and optical DAC/headphone amplifier with 3.5mm and 4.4mm headphone outputs.An ES9038Q2M DAC, PCM 32-bit/384kHz and DSD256 decoding plus up to 755mW at 32Ω provide a capable all-in-one source for wired headphones and line-output systems.Why it stands outHi-res desktop DACES9038Q2M conversion supports PCM 384kHz and DSD256 over USB.Dual headphone outputs3.5mm single-ended and 4.4mm outputs support a wider range of headphone cables.Strong 4.4mm driveUp to 755mW at 32Ω provides useful power for many full-size headphones.DAC, headphone amp and pre-outThe 3.5mm line output can feed powered speakers or an external amplifier.Best for Desktop wired headphone systems PC and Mac high-resolution audio Users with 4.4mm headphone cables DAC/preamp use with powered speakers or an amplifier Not ideal for Analog source input Bluetooth wireless playback Microphone or gaming-chat input EMiUZEK Buying Notes SK02 accepts USB and optical digital inputs only; it has no analog input. The 4.4mm connection is for headphones; verify cable termination before use. Its 3.5mm output can operate as line out, while optical can also be passed out for a downstream DAC. Frequently asked questionsCan I connect an analog source?No. Inputs are USB and optical digital audio.Does it support balanced headphones?It provides a 4.4mm headphone output; use a correctly terminated compatible cable.Can it feed powered speakers?Yes. Use the 3.5mm line output.Can it drive passive speakers?No. Add a power amplifier.What is the USB maximum?PCM 32-bit/384kHz and DSD256 from compatible software and sources.Can it output optical audio?Yes. The shared optical connection supports optical output for compatible downstream equipment.HOW TO CONNECTComputer headphonesSource: PC or MacConnection: USB-C audioOutput: 3.5mm or 4.4mm headphoneTarget: 16–300Ω headphonesNote: Select the correct gain and output mode.TV headphonesSource: TV or consoleConnection: Optical PCMOutput: Headphone outputTarget: Wired headphonesNote: Set the source to PCM stereo.Powered speakersSource: Computer or optical sourceConnection: USB or opticalOutput: 3.5mm line outTarget: Powered speakers or amplifierNote: Use line-out mode and manage system volume safely.Technical SpecificationsAudio performance Feature Specification DAC chip ESS ES9038Q2M USB maximum PCM 32-bit / 384kHz; DSD256 Optical maximum 24-bit / 192kHz Headphone impedance 16–300Ω 3.5mm output 190mW at 32Ω 4.4mm output 755mW at 32Ω THD ≤0.001% at 1kHz Connections and physical Feature Specification Inputs USB, optical Outputs 3.5mm headphone, 4.4mm headphone, 3.5mm line out / optical out Frequency response 20Hz–20kHz (±0.02dB) Power 5V USB-C Dimensions 121 × 51 × 43mm Weight 380g Recommended System Setup Setup Connection Computer headphones Computer → USB → SK02 → Headphones TV headphones TV optical PCM → SK02 → Headphones Powered speakers Digital source → SK02 line out → Powered speakers Additional Product ContentFosi Audio product comparisonCompare the models by the differences that most affect system matching and everyday use. Feature SK02 SK01 Q4 Product position Hi-res desktop DAC/amp Analog headphone amp/preamp Entry DAC/amp with tone controls DAC chip ES9038Q2M No DAC 97220-based chipset Main inputs USB, optical 3.5mm analog USB, optical, coaxial USB maximum 32-bit / 384kHz, DSD256 No USB audio 24-bit / 96kHz Headphone outputs 3.5mm, 4.4mm 3.5mm, 6.35mm 3.5mm Maximum output at 32Ω 755mW via 4.4mm 2400mW high gain 100mW Analog line output 3.5mm 3.5mm RCA Tone controls No Three-band Bass and treble Battery operation No Yes No Best use Hi-res desktop headphones Powerful analog amplification Simple PC/TV audio

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$100.83 - $116.99

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Fosi Audio Fosi Audio PH05

Fosi Audio PH05 is a one-input, five-output headphone distribution amplifier for sharing one stereo source with up to five listeners.Five independently adjustable 310mW channels, master volume and one-touch mute make it useful for group listening, teaching, podcasting and headphone comparison.Why it stands outFive independent headphone channelsEach 3.5mm output has its own level control for different listeners and headphone sensitivities.310mW per channelAll five outputs provide rated power of 310mW at 32Ω for 16–300Ω headphones.Master control and instant muteA large master volume knob and one-touch mute simplify group control.Low-noise distribution designNE5532 amplification, 105dB SNR and 0.001% THD preserve a clean shared signal.Best for Group listening sessions Studio or podcast headphone monitoring Teaching and language labs Comparing several headphones from one source Not ideal for Combining several sources into one output Headsets requiring microphone pass-through Passive speakers or speaker-level amplification EMiUZEK Buying Notes PH05 is one input to five outputs; it cannot work in reverse as a five-input mixer. All outputs are stereo 3.5mm headphone connections and do not carry microphone signals. Set master and channel volumes low before connecting headphones. Frequently asked questionsCan it accept five sources?No. PH05 distributes one stereo input to five headphone outputs.Can each listener set a different volume?Yes. Each output has an independent level control.Does it support headset microphones?No. It carries stereo playback audio only.Can it drive passive speakers?No. It is a headphone amplifier, not a speaker power amplifier.What headphones are supported?Fosi specifies 16–300Ω headphones.Can all five outputs be muted together?Yes. Use the one-touch mute function.HOW TO CONNECTGroup listeningSource: Phone, DAC, mixer or audio interfaceConnection: 3.5mm AUXOutput: Five 3.5mm outputsTarget: Up to five headphonesNote: Start with all channel levels low.Studio monitoringSource: Mixer or audio interfaceConnection: 3.5mm stereo lineOutput: Five headphone outputsTarget: Performers or reviewersNote: Use independent controls for each listener.Headphone comparisonSource: Single DAC or playerConnection: 3.5mm AUXOutput: Selected headphone outputsTarget: Multiple headphonesNote: Level-match carefully before comparing.Technical SpecificationsAudio performance Feature Specification Rated output 310mW × 5 at 32Ω Headphone impedance 16–300Ω SNR / Dynamic range 105dB / 105dB THD 0.001% SINAD / Crosstalk 90dB / 90dB Frequency response 20Hz–20kHz (±0.5dB) Connections and power Feature Specification Input 3.5mm AUX × 1 Outputs 3.5mm headphone × 5 Op-amp TI NE5532 Power DC 12V / 1A Recommended System Setup Setup Connection Group session Source → PH05 → Up to five headphones Studio Audio interface → PH05 → Performers' headphones Comparison DAC → PH05 → Multiple headphones Additional Product ContentFosi Audio product comparisonCompare the models by the differences that most affect system matching and everyday use. Feature PH05 PH04 Product position Five-channel headphone distributor Four-channel headphone distributor Inputs 1 × 3.5mm stereo 1 × 3.5mm stereo Headphone outputs 5 × 3.5mm 4 × 3.5mm Independent volume Five channels Four channels Output power 310mW per channel at 32Ω 40mW at 100Ω Supported impedance 16–300Ω Application dependent Master volume Yes Yes One-touch mute Yes No Microphone support No No Best use Five-listener monitoring Basic four-listener distribution

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$49.90

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Fosi Audio Fosi Audio T20X

Fosi Audio T20X is a Bluetooth vacuum-tube integrated amplifier for passive speakers and wired headphones.Its upgraded 100W x2 output, replaceable tubes and bass/treble controls create a compact all-in-one amplifier for desktop and bookshelf systems. Why it stands outFour reasons this product deserves a place in a well-planned audio system.100W x2 Maximum OutputThe Class D power stage provides more headroom than the T20 for compatible passive speakers.Replaceable Tube StageTube rolling lets experienced users experiment with compatible tube options.Two Listening OutputsDrive passive speakers or use the 3.5mm headphone connection from the same amplifier.Simple Wireless and Analog PlaybackBluetooth and analog input cover the most common phone, streamer and DAC setups without a complex interface. Best for Bookshelf passive-speaker systems Bluetooth desktop audio Combined speaker and headphone listening Listeners wanting tube character with higher output than the T20 Not ideal for Users requiring optical, USB or HDMI audio Balanced XLR systems Turntables without phono amplification Systems needing a dedicated subwoofer output EMiUZEK Buying Notes T20X is an integrated amplifier and can directly drive compatible 2–8Ω passive speakers. Its analog input is line level; use a phono preamp with a conventional turntable. The maximum output figure depends on speaker impedance, supply voltage and test conditions. Frequently Asked QuestionsCan the T20X drive passive speakers?Yes. It is an integrated amplifier with passive-speaker outputs.Can it connect to a turntable?Yes when the turntable has a built-in phono preamp or an external phono preamp is used.Does it include a headphone output?Yes, a 3.5mm wired headphone output is provided.Does it support optical or USB audio?No. Use Bluetooth or the analog input.Can the vacuum tubes be replaced?Yes. Use compatible tubes and switch the amplifier off before tube replacement.Can I connect an active subwoofer?No dedicated subwoofer output is specified; use a compatible system-level integration method. HOW TO CONNECTBluetooth stereoSource: Phone / tabletConnection: BluetoothOutput: Speaker terminalsTarget: Passive speakersNote: Keep initial volume low when pairing.Wired HiFiSource: Streamer / DAC / CD playerConnection: Analog line inputOutput: Speaker terminalsTarget: Passive speakersNote: Use a line-level source.Headphone systemSource: Bluetooth or analog sourceConnection: Bluetooth / line inputOutput: 3.5mm headphone outputTarget: Wired headphonesNote: Disconnect or lower speaker listening as appropriate. Technical SpecificationsAmplifier Feature Specification Product Type Bluetooth tube integrated amplifier Amplifier Chip TI TPA3221 Maximum Output 100W x2 at 4Ω Speaker Impedance 2–8Ω Audio Feature Specification Frequency Response 20Hz–20kHz (±1dB) THD ≤0.3% SNR ≥86dB Input Sensitivity ≤650mV Connectivity and Power Feature Specification Inputs Bluetooth; analog line input Outputs Passive speaker terminals; 3.5mm headphone Power Supply 24V/4.5A included DC Input Range 12–30V Recommended System Setup Setup Connection Wireless speaker system Phone → Bluetooth → T20X → passive speakers Wired stereo Streamer/DAC → line input → T20X → passive speakers Headphones Source → T20X → 3.5mm headphones Additional Product Content Feature T20X T20 P3 Product Position Higher-power tube integrated amp Compact tube integrated amp Tube preamp / headphone amp Passive Speaker Amplifier Yes Yes No Maximum Speaker Output 100W x2 at 4Ω 50W x2 at 4Ω Not applicable Inputs Bluetooth, line input Bluetooth 5.0, RCA Bluetooth, RCA Headphone Output 3.5mm 3.5mm 3.5mm Tone Controls Bass, treble Bass, treble Bass, treble Tube Rolling Compatible tubes Compatible tubes Compatible tubes Best Use More speaker headroom Compact speaker system Existing amplifier / active speakers

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$75.06 - $99.90

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Fosi Audio Fosi Audio T20

Fosi Audio T20 is a compact Bluetooth tube integrated amplifier for passive speakers and wired headphones.It combines 50W x2 Class D speaker power with replaceable vacuum tubes, RCA input and tone controls for a warm, flexible desktop stereo system. Why it stands outFour reasons this product deserves a place in a well-planned audio system.Tube-Buffered SoundReplaceable vacuum tubes add the tube stage and allow compatible tube rolling.Speaker and Headphone ListeningThe T20 powers passive speakers and also provides a front 3.5mm headphone output.Bluetooth and RCA InputsSwitch between convenient wireless playback and a conventional analog source.Compact Tone ControlIndependent bass and treble controls make it easier to adapt the system to speakers, headphones and room acoustics. Best for Desktop passive-speaker systems Bluetooth music playback Headphone and speaker listening from one compact amplifier Listeners interested in compatible tube rolling Not ideal for Users requiring optical, USB or HDMI inputs Balanced XLR audio systems Turntables without a built-in or external phono preamp Users needing a dedicated subwoofer output EMiUZEK Buying Notes T20 is an integrated speaker amplifier and can directly drive compatible 4–8Ω passive speakers. Its RCA input is line level; a conventional turntable requires a separate phono preamplifier. The 3.5mm jack is a headphone output, not a microphone connection. Frequently Asked QuestionsCan the T20 drive passive speakers directly?Yes. Connect a compatible 4–8Ω passive speaker pair to the rear speaker terminals.Can I connect a turntable?Yes only when the turntable has a built-in phono preamp or is used with an external phono preamp.Does it work as a headphone amplifier?Yes, it includes a front 3.5mm headphone output.Does it accept digital audio?No. Inputs are Bluetooth and analog RCA; optical and USB audio are not provided.Can the tubes be replaced?Yes. Use only compatible tube types and power the unit off before replacement.Does it have a subwoofer output?No dedicated subwoofer output is specified. Use a subwoofer integration method supported by your wider system. HOW TO CONNECTBluetooth speaker systemSource: Phone / tabletConnection: BluetoothOutput: Speaker terminalsTarget: Passive speakersNote: Pair the source and set volume low before playback.Wired stereo systemSource: DAC / streamer / CD playerConnection: RCA line inputOutput: Speaker terminalsTarget: Passive speakersNote: Use a fixed or controlled line-level source.Headphone listeningSource: Phone via Bluetooth or RCA sourceConnection: Bluetooth / RCAOutput: 3.5mm headphone outputTarget: Wired headphonesNote: Lower volume before inserting headphones. Technical SpecificationsAmplifier Feature Specification Product Type Bluetooth tube integrated amplifier Amplifier Chip TI TPA3116 Maximum Speaker Output 50W x2 at 4Ω Speaker Impedance 4–8Ω Connectivity Feature Specification Inputs Bluetooth 5.0; RCA line input Outputs Passive speaker terminals; 3.5mm headphone Tone Controls Bass and treble Audio Feature Specification Vacuum Tubes Replaceable 6K4 pair Frequency Response 20Hz–20kHz (±1.5dB) THD ≤0.04% SNR ≥99dB Recommended System Setup Setup Connection Wireless stereo Phone → Bluetooth → T20 → passive speakers Wired stereo Streamer/DAC → RCA → T20 → passive speakers Headphones Source → T20 → 3.5mm headphones Additional Product Content Feature T20 T20X P3 Product Position 50W x2 tube integrated amp 100W x2 tube integrated amp Tube preamp / headphone amp Passive Speaker Amplifier Yes Yes No Inputs Bluetooth 5.0, RCA Bluetooth, AUX Bluetooth, RCA Speaker Output 50W x2 max at 4Ω 100W x2 max at 4Ω None Headphone Output 3.5mm 3.5mm 3.5mm Tone Controls Bass, treble Bass, treble Bass, treble Tube Rolling Compatible tubes Compatible tubes Compatible tubes Best Use Compact speaker/headphone system Higher-power speaker system Add tube preamp/headphone stage

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$89.90 - $99.37

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Fosi Audio Fosi Audio HT4S

Fosi Audio HT4S is a compact 4.1/5.0-channel integrated amplifier for multi-speaker, outdoor-audio and simulator systems.Bluetooth, optical and 3.5mm inputs, five amplified channels and a switchable sub/center channel create a flexible multi-speaker system without a full-size AV receiver.Why it stands outSwitchable 4.1 or 5.0 operationConfigure four main speakers plus a subwoofer channel, or use five full-range speaker channels.Built-in multi-channel powerProvides four 30W channels plus a 60W sub channel in 4.1 mode, or five 30W channels in 5.0 mode.Digital and wireless inputsConnect optical PCM, 3.5mm analog or Bluetooth sources.Remote and front-panel controlAdjust source, volume, tone and operation without a separate controller.Best for Outdoor and patio multi-speaker systems Sim-racing bass-shaker installations Compact 4.1 or 5.0 speaker systems TV systems with optical PCM output Not ideal for Dolby or DTS surround decoding Systems requiring HDMI ARC Speakers below the specified 4Ω minimum EMiUZEK Buying Notes HT4S is a multi-channel amplifier, not an HDMI adapter or surround-sound decoder. Set the source to PCM stereo when using optical; encoded Dolby/DTS signals are not supported. The SUB/CEN output changes function with the selected mode, so confirm the switch setting before connecting speakers. Frequently asked questionsDoes HT4S have HDMI?No. Inputs are Bluetooth, optical and 3.5mm AUX.Does it decode Dolby or DTS?No. Use a compatible PCM signal.Can it run five passive speakers?Yes, in 5.0 mode with compatible 4–8Ω speakers.Can it power a passive subwoofer?Yes, in 4.1 mode through the dedicated amplified SUB/CEN channel.Does it have a line output?Yes, a 3.5mm pre-out is provided.Can it be used outdoors?It can power outdoor speakers, but the amplifier itself should remain protected indoors.HOW TO CONNECTOptical TV systemSource icon: tvSource: TV / projectorConnection: Optical PCMOutput connection: Speaker terminalsTarget icon: speakersOutput: Four or five passive speakersOutdoor multi-speaker systemSource icon: phoneSource: Phone / streamerConnection: Bluetooth or AUXOutput connection: Speaker terminalsTarget icon: speakersOutput: Outdoor passive speakersSim-racing systemSource icon: computerSource: PC / simulator audioConnection: Optical, AUX or BluetoothOutput connection: Speaker and SUB/CEN outputsTarget icon: speakersOutput: Speakers and compatible bass shaker / passive subwooferTechnical SpecificationsConnections Feature Specification Inputs Bluetooth; optical; 3.5mm AUX Outputs Five speaker channels; 3.5mm pre-out Speaker impedance 4–8Ω Amplification and physical Feature Specification 4.1 rated output 30W × 4 + 60W × 1 @ 4Ω 5.0 rated output 30W × 5 Maximum output 50W × 5 @ 4Ω SNR ≥88dB THD ≤0.03% AC input 110–240V Dimensions 6.1 × 7.2 × 2 in Additional Product ContentComparison: Which Fosi Audio model is right for you? Model HT4S BT30D BT30D Pro System type 4.1 / 5.0 multi-speaker 2.1 stereo Higher-output 2.1 stereo Digital input Optical None None Amplified outputs Up to five channels Stereo + passive subwoofer Stereo + passive subwoofer Maximum stated output 50W × 5 @ 4Ω 50W × 2 + 100W 165W × 2 + 350W @ 4Ω Best use Outdoor, sim racing, multi-speaker Compact moderate-output 2.1 Higher-output 2.1

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$140.39 - $156.47

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Fosi Audio Fosi Audio P3

Fosi Audio P3 is a compact tube preamplifier and headphone amplifier with RCA and Bluetooth 5.1 source inputs.Replaceable 5654W tubes, aptX-family Bluetooth codecs, bass and treble controls and outputs for headphones, amplifiers and powered speakers make it a versatile analog control stage.Why it stands outTube preamplifier characterA true tube stage adds adjustable tube character between line-level sources and the rest of the audio system.Wireless and wired inputsBluetooth 5.1 with Qualcomm QCC3031 and RCA input support convenient source switching.Headphone and system outputsA 3.5mm headphone jack, RCA output and AUX output support personal listening and downstream components.Hands-on tone controlFront bass and treble controls help adapt sound to headphones, speakers and room conditions.Best for Adding Bluetooth and tube character to a power amplifier Desktop wired headphone listening Active speaker systems needing volume and tone control Users interested in replaceable tube tuning Not ideal for Driving passive speakers directly Turntables without a phono preamp Systems requiring USB, optical or coaxial digital inputs EMiUZEK Buying Notes P3 is a preamplifier/headphone amplifier, not a speaker power amplifier. Its RCA input is line level; a standard turntable needs a phono preamp. RCA and AUX are downstream outputs, while the front 3.5mm jack is for headphones. Frequently asked questionsCan P3 drive passive speakers?No. Connect it to a separate power amplifier or powered speakers.Can I use wired headphones?Yes. It supports 16–300Ω headphones through the front 3.5mm output.Does it accept digital inputs?Bluetooth is supported, but there is no USB, optical or coaxial input.Can I connect a turntable?Only through a built-in or external phono preamp before the RCA input.Can I connect an active subwoofer?The AUX or RCA line output can feed compatible downstream equipment; confirm the subwoofer's input and system gain arrangement.Are the tubes replaceable?Yes. The supplied 5654W tubes are replaceable with compatible tube types.HOW TO CONNECTPower amplifier systemSource: Streamer, DAC or Bluetooth deviceConnection: RCA or BluetoothOutput: RCA outputTarget: Power amplifier → passive speakersNote: P3 controls source level; the power amplifier drives the speakers.Powered speaker systemSource: Phone, streamer or DACConnection: Bluetooth or RCAOutput: RCA or AUX outputTarget: Powered speakersNote: Begin with low volume on both devices.Headphone setupSource: Phone, streamer or DACConnection: Bluetooth or RCAOutput: 3.5mm headphone outputTarget: 16–300Ω wired headphonesNote: Use the front volume and tone controls.Technical SpecificationsAudio performance Feature Specification Product type Tube preamplifier / headphone amplifier Headphone impedance 16–300Ω Headphone output 250mW at 16Ω; 150mW at 32Ω; 32mW at 250Ω; 20mW at 300Ω Frequency response 20Hz–20kHz (±1dB) SNR ≥103dB THD ≤0.02% Dynamic range 104dB Crosstalk 95dB Connectivity and power Feature Specification Inputs Bluetooth 5.1, RCA Outputs RCA, AUX, 3.5mm headphone Bluetooth chip Qualcomm QCC3031 Bluetooth codecs SBC, AAC, aptX, aptX HD, aptX LL Bluetooth range ≥10m Power input DC 12V / 1.5A–3A Recommended System Setup Setup Connection Stereo preamp Source → P3 → Power amplifier → Passive speakers Active speakers Source → P3 → Powered speakers Headphones Source → P3 → Wired headphones Additional Product ContentFosi Audio product comparisonCompare Fosi Audio compact preamplifier and tube DAC options by the capabilities that determine how they fit into a system. Feature P3 P4 GR40 Product position Tube preamp + headphone amp Solid-state analog preamp Tube DAC + headphone amp Analog inputs RCA RCA × 3 None Digital / wireless inputs Bluetooth 5.1 None Bluetooth, USB, optical, coaxial Main outputs RCA, AUX RCA, pre-out RCA Headphone output 3.5mm No 3.5mm Speaker amplification No No No Tube stage Yes, replaceable 5654W No Yes Tone controls Bass and treble Bass and treble with bypass Bass and treble Remote control No Yes No SNR ≥103dB ≥110dB ≥103dB Best use Bluetooth tube preamp and headphones Multiple analog source control Digital sources with tube conversion

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$79.90

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Fosi Audio Fosi Audio DS1

Fosi Audio DS1 is a portable USB DAC and headphone amplifier for phones, tablets and computers.An ESS ES9038Q2M DAC, 3.5mm single-ended and 4.4mm balanced outputs, and high-resolution decoding provide a compact upgrade for wired headphones.Why it stands outESS ES9038Q2M conversionA proven ESS DAC architecture supports detailed portable playback.Dual headphone outputsConnect conventional 3.5mm headphones or compatible 4.4mm balanced headphones.High-resolution USB audioSupports PCM up to 32-bit/768kHz and native DSD512.Portable source-powered designRuns from the connected USB device without a separate battery or charger.Best for Wired headphone listening from USB-C phones Laptop and desktop USB audio Portable Hi-Res music systems Headphones requiring 3.5mm or 4.4mm output Not ideal for Wireless Bluetooth listening Headsets requiring microphone or inline-control support Driving passive speakers EMiUZEK Buying Notes DS1 has no battery and draws power from the connected source device. Use a compatible OTG adapter or cable for devices without USB-C; Lightning accessories may be required separately. Do not use a 3.5mm-to-4.4mm adapter with the balanced output. Frequently asked questionsDoes DS1 support both 3.5mm and 4.4mm headphones?Yes, it provides separate 3.5mm single-ended and 4.4mm balanced outputs.Does it include Bluetooth?No. DS1 is a wired USB DAC/headphone amplifier.Does it need charging?No. It is powered by the connected USB source.Can it work with Windows and Mac?Yes. It supports Windows and macOS, subject to the source device and playback software.Can it answer calls through a headset microphone?No. It is intended for audio playback and does not provide headset microphone control.Is warmth during use normal?Some warmth is normal for a compact high-output USB DAC.HOW TO CONNECTUSB-C phone listeningSource icon: phoneSource: USB-C phone / tabletConnection: USB-C audioOutput connection: 3.5mm headphone outputTarget icon: headphonesOutput: Wired headphonesBalanced portable listeningSource icon: phoneSource: USB-C phone / playerConnection: USB-C audioOutput connection: 4.4mm balanced outputTarget icon: headphonesOutput: Compatible balanced headphonesComputer audioSource icon: computerSource: Windows PC / MacConnection: USB audioOutput connection: 3.5mm or 4.4mm outputTarget icon: headphonesOutput: Wired headphonesTechnical SpecificationsAudio architecture Feature Specification Product type Portable USB DAC and headphone amplifier DAC chipset ESS ES9038Q2M Maximum PCM 32-bit / 768kHz DSD DSD64 / 128 / 256 / 512 Outputs and performance Feature Specification Headphone outputs 3.5mm single-ended; 4.4mm balanced Output power 120mW @ 32Ω single-ended; 220mW @ 32Ω balanced Recommended impedance 16–300Ω SNR 120dB Weight 38g Additional Product ContentComparison: Which Fosi Audio model is right for you? Model DS1 DS2 2024 DS3 Primary use Portable Hi-Res music Portable Hi-Res music Music and gaming spatial audio DAC / processing ESS ES9038Q2M Dual CS43131 Hardware 7.1 processing Maximum PCM 32-bit / 768kHz 32-bit / 384kHz 32-bit / 768kHz Maximum DSD DSD512 DSD256 DSD512 Maximum stated output 220mW @ 32Ω balanced 510mW @ 32Ω balanced (manual) 220mW @ 32Ω Best use Compact ESS dongle Higher-power balanced portable setup Gaming effects and spatial audio

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$78.84

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Fosi Audio Fosi Audio MC101

Fosi Audio MC101 is a compact Bluetooth stereo integrated amplifier for passive speakers, styled with an illuminated analog VU meter.Bluetooth 5.3, RCA input, pre-out, tone controls and up to 100W per channel maximum output combine modern connectivity with tactile vintage-inspired control.Why it stands outIlluminated analog VU meterThe moving pointer provides a distinctive visual indication that follows the audio signal.Bluetooth and RCA inputsSwitch between Bluetooth 5.3 wireless playback and a conventional analog source.Passive-speaker amplificationDual TPA3116 amplifiers provide up to 100W × 2 maximum at 4Ω.Pre-out system expansionConnect compatible powered equipment or an additional amplifier from the line-level pre-output.Best for Desktop and bookshelf passive speakers Simple Bluetooth stereo systems Users who value physical tone controls Systems needing a pre-output for expansion Not ideal for HDMI ARC, optical or USB sources Headphone listening Turntables without a phono preamplifier EMiUZEK Buying Notes MC101 powers passive speakers; the pre-out is line level and should not be connected to passive speakers. The 100W × 2 figure is a maximum specification at 4Ω and depends on power supply and load. A turntable needs a built-in or separate phono preamplifier before the RCA input. Frequently asked questionsCan MC101 power passive speakers?Yes, through its rear speaker binding posts.Does it have a subwoofer output?It has a full-range pre-out; a powered subwoofer must provide a compatible input and crossover.Does it include a phono stage?No.Can it connect to a TV?Only when the TV provides compatible analog output; there is no optical or HDMI input.What Bluetooth codecs are supported?SBC and AAC.Can it drive headphones?No headphone output is provided.HOW TO CONNECTBluetooth stereoSource icon: phoneSource: Phone / tabletConnection: Bluetooth 5.3Output connection: Speaker terminalsTarget icon: speakersOutput: Passive speakersWired stereoSource icon: streamerSource: Streamer / DAC / TV analog outputConnection: RCA line inputOutput connection: Speaker terminalsTarget icon: speakersOutput: Passive speakersExpanded systemSource icon: streamerSource: Bluetooth or RCA sourceConnection: Bluetooth or RCAOutput connection: Pre-outTarget icon: speakersOutput: Powered subwoofer, powered speakers or downstream amplifierTechnical SpecificationsConnections Feature Specification Inputs Bluetooth 5.3; RCA Outputs Speaker binding posts; pre-out Bluetooth codecs SBC; AAC Bluetooth range ≥10m Amplification Feature Specification Channels 2 Amplifier chipset 2 × TI TPA3116 Maximum output 100W × 2 @ 4Ω SNR ≥100dB THD ≤0.03% Frequency response 20Hz–20kHz (±1.8dB) DC input 12–24V Supplied adapter 24V / 4.5A Additional Product ContentComparison: Which Fosi Audio model is right for you? Model MC101 BT20A BT20A Pro Amplifier Dual TPA3116 Dual TPA3116D2 TPA3255 Maximum stated output 100W × 2 @ 4Ω 100W × 2 300W × 2 @ 4Ω Pre-out Yes No 3.5mm variable pre-out Signature feature Illuminated VU meter Simple compact stereo Higher output and op-amp rolling Best use Vintage-style Bluetooth stereo Entry compact system Expandable higher-output system

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$58.86 - $99.90

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Fosi Audio Fosi Audio Q4

Fosi Audio Q4 is a compact desktop DAC and headphone amplifier that converts USB, optical or coaxial digital audio to headphones and RCA analog output.Volume plus bass and treble controls, 24-bit/192kHz S/PDIF decoding and support for 16–200Ω headphones make it a practical entry-level computer or TV audio upgrade.Why it stands outThree digital inputsUSB, optical and coaxial connections support computers, TVs, consoles and digital transports.Headphone and RCA outputsListen through 3.5mm headphones or feed an amplifier and powered speakers through RCA.Direct tone adjustmentFront bass and treble controls allow quick system tuning.Compact plug-and-play controlInput selection and analog volume are integrated into a small desktop chassis.Best for Entry-level computer audio TV optical PCM to headphones or stereo system Desktop headphones and powered speakers Users wanting physical bass and treble controls Not ideal for Dolby or DTS bitstream decoding Balanced headphone systems Headphones above the specified 200Ω range EMiUZEK Buying Notes Set TVs and consoles to two-channel PCM; Q4 does not decode Dolby or DTS. Inserting headphones can mute the RCA output. USB audio reaches 24-bit/96kHz; optical and coaxial reach 24-bit/192kHz. Frequently asked questionsCan Q4 connect to a TV?Yes, through optical or coaxial when the TV is set to PCM stereo.Does it decode Dolby or DTS?No. Use PCM output to avoid noise or silence.Can it drive passive speakers?No. RCA must feed an amplifier, or use powered speakers.Can I use headphones and RCA together?The headphone connection can mute RCA output, so treat them as alternate outputs.Does USB need a driver?It is generally plug-and-play on listed systems; select Fosi Audio Q4 as the playback device.Can I connect an analog source?No. All Q4 inputs are digital.HOW TO CONNECTComputer headphonesSource: PC or MacConnection: USB audioOutput: 3.5mm headphoneTarget: 16–200Ω headphonesNote: Select Q4 as the playback device.TV headphonesSource: TelevisionConnection: Optical PCMOutput: 3.5mm headphoneTarget: Wired headphonesNote: Disable Dolby and DTS output.Stereo systemSource: Computer, TV or transportConnection: USB, optical or coaxialOutput: RCATarget: Amplifier or powered speakersNote: Use Q4 volume and tone controls.Technical SpecificationsAudio performance Feature Specification USB sampling Up to 24-bit / 96kHz Optical / coaxial Up to 24-bit / 192kHz Headphone output 100mW at 32Ω Headphone impedance 16–200Ω THD / SNR ≤0.01% / ≥105dB RCA output level 2.3V Connections and physical Feature Specification Inputs USB, optical, coaxial Outputs 3.5mm headphone, RCA Chipset SA9023 + CS8412 + 97220 + NE5532 Power 5V Dimensions 73.5 × 98 × 33mm Weight 251g Recommended System Setup Setup Connection Computer headphones Computer → USB → Q4 → Headphones TV system TV optical PCM → Q4 → Amplifier Powered speakers Digital source → Q4 RCA → Powered speakers Additional Product ContentFosi Audio product comparisonCompare the models by the differences that most affect system matching and everyday use. Feature Q4 K5 Pro SK02 Product position Entry desktop DAC/amp Gaming DAC/amp Higher-performance desktop DAC/amp USB maximum 24-bit / 96kHz 24-bit / 96kHz 32-bit / 384kHz, DSD256 Other digital inputs Optical, coaxial Optical, coaxial Optical Headphone outputs 3.5mm 3.5mm 3.5mm, 4.4mm Maximum headphone power 100mW at 32Ω 500mW at 32Ω 755mW at 32Ω via 4.4mm Microphone input No Yes No RCA output Yes Yes No Tone controls Bass, treble Bass, treble No Balanced output No No 4.4mm Best use Simple PC/TV audio Gaming with microphone Hi-res desktop headphones

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$45.91 - $69.90

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Fosi Audio Fosi Audio SK01

Fosi Audio SK01 is a battery-powered analog headphone amplifier and preamplifier with 3.5mm line input, dual headphone jacks and adjustable three-band tone control.Up to 2400mW at 32Ω in high gain, pure bypass, loudness and a 2500mAh battery make it flexible for desktop and transportable wired listening.Why it stands outHigh-power analog headphone driveHigh gain delivers up to 2400mW at 32Ω for a broad 16–300Ω headphone range.Three-band tone shapingSeparate treble, midrange and bass controls allow more precise adjustment than basic two-band designs.Pure and loudness modesBypass removes tone processing, while loudness improves perceived bass and treble at low listening levels.Headphone amp and preamp3.5mm line out feeds an amplifier or powered speakers with the same volume and tone control.Best for Powerful wired headphone listening Analog sources needing portable amplification Users wanting three-band tone control Preamp use with powered speakers or a power amplifier Not ideal for USB digital audio or DAC conversion Bluetooth wireless playback Balanced headphone connections EMiUZEK Buying Notes SK01 is analog only; USB-C is for charging and does not carry audio data. It cannot drive passive speakers directly; line out must feed an amplifier. High gain can become very loud—start at minimum volume before wearing headphones. Frequently asked questionsDoes USB-C carry audio?No. USB-C is for 5V charging only.Can it work as a preamp?Yes. Use 3.5mm line out into an amplifier or powered speakers.Can it drive passive speakers?No. A separate power amplifier is required.What headphones are supported?Fosi specifies 16–300Ω.Can tone controls be bypassed?Yes. PURE mode bypasses the tone circuit.How long does the battery last?Fosi states up to about six hours, depending on use and load.HOW TO CONNECTPortable headphonesSource: Phone, DAP or dongle DACConnection: 3.5mm line inOutput: 3.5mm or 6.35mm headphoneTarget: Wired headphonesNote: USB-C is not an audio input.Desktop preampSource: DAC or streamerConnection: 3.5mm line inOutput: 3.5mm line outTarget: Power amplifier or powered speakersNote: SK01 controls level and tone.High-impedance headphonesSource: Line-level DACConnection: 3.5mm line inOutput: 6.35mm headphoneTarget: 16–300Ω headphonesNote: Choose gain carefully and start low.Technical SpecificationsAudio performance Feature Specification High / low gain output 2400mW / 300mW at 32Ω Headphone impedance 16–300Ω SNR 108dB THD ≤0.001% at 1kHz / 770mV Frequency response 20Hz–20kHz (±0.05dB) Noise floor / Crosstalk 20μV / 83dB Connections and power Feature Specification Input 3.5mm line in Outputs 3.5mm line out; 3.5mm and 6.35mm headphones Tone adjustment Treble ±8dB; mid ±10dB; bass ±11dB Battery 2500mAh Charging DC 5V USB-C; power only Recommended System Setup Setup Connection Portable Phone/DAP → SK01 → Headphones Desktop DAC → SK01 → Headphones Preamp Source → SK01 line out → Power amplifier Additional Product ContentFosi Audio product comparisonCompare the models by the differences that most affect system matching and everyday use. Feature SK01 SK02 P3 Product position Analog headphone amp / preamp USB/optical DAC headphone amp Tube preamp / headphone amp Digital DAC No Yes, ES9038Q2M Bluetooth input only Main inputs 3.5mm line USB, optical Bluetooth, RCA Headphone outputs 3.5mm, 6.35mm 3.5mm, 4.4mm 3.5mm Maximum output at 32Ω 2400mW high gain 755mW via 4.4mm 150mW Balanced headphone output No 4.4mm No Tone controls Treble, mid, bass No Bass, treble Battery operation Yes No No Line / pre-out 3.5mm 3.5mm line / optical RCA, AUX Best use Powerful analog portable amp Hi-res desktop DAC/amp Tube Bluetooth preamp

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$25.42 - $79.00

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Fosi Audio Fosi Audio MC351

Fosi Audio MC351 is a compact 2.1-channel integrated digital amplifier for passive stereo speakers and a passive subwoofer.Dual TI TPA3255 amplifier chips, broad digital and analog inputs and up to 165W × 2 + 350W at 4Ω make it a practical control center for powerful 2.1 systems.Why it stands outDedicated 2.1 amplificationSeparate stereo and passive-subwoofer amplification builds a complete 2.1 system without a second power amp.Dual TPA3255 architectureTwo TI TPA3255 amplifier chips provide high output for speakers and a passive subwoofer.Broad source compatibilityBluetooth 5.3, USB, optical, coaxial and RCA inputs cover common music, computer and TV sources.System expansion through pre-outThe pre-out connection supports a powered subwoofer or compatible downstream equipment.Best for Passive bookshelf or floorstanding speaker systems 2.1 systems using a passive subwoofer TV and desktop systems using optical, coaxial or USB audio Users who need both wireless and wired source inputs Not ideal for Users needing HDMI ARC or TV-remote CEC control Headphone-only systems Turntables without a built-in or external phono preamp EMiUZEK Buying Notes MC351 directly powers passive speakers and a passive subwoofer; these are different from line-level active speakers. USB is an audio-data input, not a power input. RCA is line level and does not replace a phono preamp for a standard turntable. Frequently asked questionsCan MC351 drive passive speakers?Yes. It is designed for 4–8Ω passive speakers.Can it power a passive subwoofer?Yes. It has a dedicated amplified passive-subwoofer output.Can I connect a powered subwoofer?Yes. Use the line-level pre-out with a compatible powered subwoofer.Does it support HDMI ARC?No. Use optical, coaxial or RCA audio from a television.What does the USB port do?It receives USB digital audio from a compatible computer or source; it does not power the amplifier.Can I connect a turntable?Only if the turntable has a built-in phono preamp or you add an external phono preamp.HOW TO CONNECT2.1 passive speaker systemSource: Computer, streamer or TVConnection: USB, optical, coaxial, RCA or BluetoothOutput: Speaker terminals + passive-subwoofer outputTarget: Passive speakers + passive subwooferNote: Match speaker impedance and begin with low volume.Stereo speaker systemSource: Any supported digital or analog sourceConnection: Chosen inputOutput: Left/right speaker terminalsTarget: 4–8Ω passive speakersNote: Leave the passive-subwoofer output unused for a 2.0 system.System with powered subwooferSource: Any supported sourceConnection: Chosen inputOutput: Speaker terminals + pre-outTarget: Passive speakers + powered subwooferNote: Set crossover and level on the powered subwoofer.Technical SpecificationsCore specifications Feature Specification Product type 2.1-channel integrated digital amplifier Amplifier chips TI TPA3255 × 2 Maximum output 165W × 2 + 350W at 4Ω Speaker impedance 4–8Ω THD ≤0.03% SNR / Dynamic range ≥100dB / ≥100dB Power input range DC 24–48V Inputs and outputs Feature Specification Inputs Bluetooth 5.3, USB, optical, coaxial, RCA Outputs Passive speakers, passive subwoofer, pre-out USB sampling Up to 24-bit / 96kHz Optical / coaxial sampling Up to 32-bit / 192kHz Frequency response 20Hz–20kHz (±0.5dB) Subwoofer output range 20Hz–250Hz Recommended System Setup Setup Connection 2.1 passive system Source → MC351 → Passive speakers + passive subwoofer TV system TV optical output → MC351 → Passive speakers Powered sub expansion Source → MC351 → Passive speakers + pre-out → Powered subwoofer Additional Product ContentFosi Audio product comparisonCompare the two compact Fosi Audio integrated amplifiers by their power, output structure and intended system layout. Feature MC351 MC331 Product position High-power 2.1 digital integrated amplifier Tube DAC / integrated stereo amplifier Built-in speaker amplifier Yes Yes Maximum output 165W × 2 + 350W at 4Ω 105W × 2 at 4Ω Main inputs Bluetooth 5.3, USB, optical, coaxial, RCA Bluetooth, USB, optical, coaxial, RCA Speaker output Stereo passive speakers Stereo passive speakers Passive subwoofer output Yes, dedicated amplified output No Line-level pre-out Yes Yes Headphone output No Yes, 3.5mm Tube stage No Yes, replaceable tubes Best use Powerful passive-speaker 2.1 system Compact tube stereo and headphone system

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$117.72 - $169.90

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Fosi Audio Fosi Audio BT30D Pro

Fosi Audio BT30D Pro is a TPA3255-based 2.1-channel Bluetooth integrated amplifier for passive stereo speakers and passive or powered subwoofers.High-output Class-D amplification, separate bass controls and flexible subwoofer connections make it a compact control center for a powerful 2.1 system. Why it stands outHigh-output 2.1 amplificationDedicated stereo and subwoofer channels provide up to 165 W × 2 plus 350 W maximum at 4 Ω.Flexible subwoofer supportConnect a passive subwoofer from the amplified output or powered equipment from the 3.5 mm full-range line output.Independent system tuningMaster volume, bass, treble, subwoofer volume and subwoofer frequency controls support practical room integration.Bluetooth and RCA inputsWorks with wireless mobile sources or conventional analog line-level equipment. Best for Higher-output compact 2.1 systems Passive bookshelf or floor-standing speakers Passive or powered subwoofer integration Desktop, living-room and small TV systems with analog audio Not ideal for Systems requiring HDMI ARC, optical or USB inputs Users needing a headphone output Turntables without a phono preamplifier EMiUZEK Buying Notes The advertised 165 W × 2 + 350 W figures are maximum ratings at 4 Ω and depend on the power supply and load. The 3.5 mm output is full-range; powered subwoofers should use their own crossover where required. Bluetooth has priority over RCA, so disconnect Bluetooth to return to the wired input. Frequently asked questionsCan it power passive speakers and a passive subwoofer?Yes. It provides amplified outputs for both.Can it connect to a powered subwoofer?Yes, using the 3.5 mm full-range output and the powered subwoofer's compatible input.Can it operate as a 2.0 amplifier?Yes. A subwoofer is optional.Does it support aptX?No. The official instructions state that aptX, aptX HD and aptX Low Latency are not supported.Can it connect directly to a turntable?Only if the turntable provides line-level output; otherwise add a phono preamplifier.Can it connect to a TV?Yes when the TV has compatible analog output. It does not have HDMI ARC or optical input. HOW TO CONNECTHigh-output passive 2.1 systemSource icon: streamerSource: Streamer / DAC / phoneConnection: RCA or BluetoothOutput connection: Stereo speaker terminals + passive subwoofer terminalsTarget icon: speakersOutput: Passive speakers + passive subwooferPowered subwoofer systemSource icon: TVSource: TV analog output / DACConnection: RCAOutput connection: Stereo speaker terminals + 3.5 mm full-range outputTarget icon: speakersOutput: Passive speakers + powered subwoofer Passive 2.0 stereo systemSource icon: streamerSource: Streamer / DAC / phoneConnection: RCA or BluetoothOutput connection: Stereo speaker terminalsTarget icon: speakersOutput: Two passive speakersNote: A subwoofer is optional; leave the subwoofer outputs unused for a 2.0 system.Technical SpecificationsInputs Feature Specification Bluetooth 5.0 Included RCA line input Included Outputs Feature Specification Stereo passive-speaker output Included Passive-subwoofer speaker output Included 3.5 mm full-range line output Included Amplification Feature Specification Amplifier Chip TI TPA3255 Maximum Output 165 W × 2 + 350 W at 4 Ω Speaker Impedance 2–8 Ω Frequency Response 20 Hz–20 kHz (±1 dB) THD ≤0.04% SNR ≥108 dB Input Sensitivity 700 mV Passive Subwoofer Frequency Adjustment up to 300 Hz Connectivity and power Feature Specification Bluetooth Range up to 50 ft without obstacles DC Input Range 12–36 V Power Adapter dependent on selected variant Additional Product ContentComparison: BT30D or BT30D Pro? Feature BT30D BT30D Pro Amplifier architecture 2 × TPA3116D2 TPA3255 Maximum output 50 W × 2 + 100 W 165 W × 2 + 350 W at 4 Ω DC input range Supplied 24 V / 4.5 A 12–36 V Best use Compact moderate-output 2.1 Higher-output 2.1 systems

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$109.90 - $133.19

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Fosi Audio Fosi Audio TB10D

Fosi Audio TB10D is a compact analog stereo power amplifier for driving passive speakers from a line-level source.Its TI TPA3255 power stage, 300W x2 maximum rating and front bass/treble controls deliver strong value for simple, adjustable HiFi systems. Why it stands outFour reasons this product deserves a place in a well-planned audio system.TPA3255 AmplificationTexas Instruments Class D architecture provides high efficiency and substantial power from a compact chassis.300W x2 Maximum RatingThe amplifier offers useful headroom for compatible 2–8Ω passive speakers; real output depends on the supply and speaker load.Front Tone ControlsDedicated bass and treble knobs allow quick adjustment without an app or external equalizer.Straightforward Analog SystemOne RCA input and speaker outputs keep setup simple for users who already own a DAC, streamer or preamp. Best for Budget-focused passive-speaker systems Users who want physical bass and treble adjustment Desktop and small-room stereo systems Pairing with an existing DAC, streamer or preamp Not ideal for Users requiring Bluetooth, USB, optical or HDMI inputs Balanced XLR systems Headphone listening Systems requiring a dedicated subwoofer or preamplifier output EMiUZEK Buying Notes TB10D is an analog speaker amplifier; it requires a separate line-level source. The 300W x2 figure is a maximum rating under specific conditions, not continuous output with every power supply and speaker. It has no headphone, Bluetooth or dedicated subwoofer output. Frequently Asked QuestionsCan the TB10D drive passive speakers directly?Yes. It supports compatible 2–8Ω passive speakers.Does it include Bluetooth?No. Add a Bluetooth receiver or streamer to the RCA input if wireless playback is needed.Can I connect a turntable?Only through a turntable with built-in phono output or a separate phono preamplifier.Does it have a subwoofer output?No dedicated subwoofer or pre-out is provided.Can I use a DAC or network streamer?Yes. Connect its analog line output to the TB10D RCA input.What does 300W x2 mean?It is the specified maximum output under particular supply and load conditions; usable continuous power varies with the system. HOW TO CONNECTDAC stereo systemSource: Computer / digital sourceConnection: USB or digital to DAC; RCA from DACOutput: Speaker terminalsTarget: Passive speakersNote: Set the DAC to line or controlled output as appropriate.Network streaming systemSource: Network streamerConnection: RCA line outputOutput: Speaker terminalsTarget: Passive speakersNote: Use the streamer for source selection and playback.TV stereo systemSource: TelevisionConnection: Optical/HDMI to external DAC; RCA to TB10DOutput: Speaker terminalsTarget: Passive speakersNote: TB10D does not accept TV digital audio directly. Technical SpecificationsAmplifier Feature Specification Product Type Analog stereo Class D amplifier Amplifier Chip TI TPA3255 Maximum Output 300W x2 at 4Ω Speaker Impedance 2–8Ω Audio Feature Specification Frequency Response 20Hz–40kHz (±2dB) THD ≤0.3% SNR ≥90dB Input Sensitivity ≤600mV Connectivity and Power Feature Specification Input Stereo RCA line input Output Passive speaker binding posts Tone Controls Bass and treble DC Input 18–48V Included Power Supply 32V/5A Recommended System Setup Setup Connection DAC system Digital source → DAC → RCA → TB10D → passive speakers Streamer system Streamer → RCA → TB10D → passive speakers TV system TV → external DAC → RCA → TB10D → passive speakers Additional Product Content Feature TB10D V3 Stereo BT20A Pro Product Position Tone-control stereo amp Pure stereo amp Bluetooth stereo amp Amplifier Chip TPA3255 TPA3255 TPA3255 Maximum Output 300W x2 at 4Ω 300W x2 at 4Ω 300W x2 at 4Ω Analog Input RCA RCA RCA Bluetooth No No Yes Tone Controls Bass, treble No Bass, treble Pre-out No Yes Yes Speaker Load 2–8Ω 2–8Ω 2–8Ω Best Use Simple adjustable stereo Minimal pure analog path Wireless stereo system

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$79.90

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Fosi Audio Fosi Audio BT30D

Fosi Audio BT30D is a compact 2.1-channel Bluetooth integrated amplifier for two passive speakers and a passive or powered subwoofer.Dedicated subwoofer level and crossover controls make it a straightforward way to build an adjustable small-room, desktop or TV audio system. Why it stands outTrue 2.1-channel speaker controlSeparate stereo and subwoofer amplification supports passive speakers plus a passive subwoofer from one compact unit.Passive and powered subwoofer flexibilitySpeaker-level subwoofer output and a line-level subwoofer connection support different bass-system configurations.Dedicated bass integrationSubwoofer volume and cutoff adjustment help blend low frequencies with the main speakers. Compact analog controlMaster volume, bass, treble, subwoofer level and crossover adjustment are available directly from the front panel.Best for Compact 2.1 passive-speaker systems Desktop and small-room audio Adding an adjustable subwoofer to bookshelf speakers Bluetooth or RCA playback Not ideal for Systems requiring HDMI ARC or digital audio inputs Users needing a headphone output Large high-output home-theater systems EMiUZEK Buying Notes The main left/right outputs are for passive speakers. Use the dedicated speaker output for a passive subwoofer or the line-level output for a powered subwoofer. It has no phono stage; a turntable requires line output or an external phono preamplifier. Frequently asked questionsCan it power a passive subwoofer?Yes, through the dedicated subwoofer speaker output.Can it connect to a powered subwoofer?Yes, through its line-level subwoofer output.Can it be used without a subwoofer?Yes, it can operate as a 2.0-channel amplifier for passive speakers.Can it connect to a TV?Yes when the TV provides compatible analog audio output; it has no HDMI or optical input.Can it power active speakers?The main speaker outputs are amplified for passive speakers. A compatible line-level output should be used for powered equipment.Does it include Wi-Fi streaming?No. Wireless playback is through Bluetooth. HOW TO CONNECTPassive 2.1 systemSource icon: phoneSource: Phone / streamerConnection: Bluetooth or RCAOutput connection: L/R speaker terminals + passive subwoofer terminalsTarget icon: speakersOutput: Two passive speakers + passive subwooferPowered subwoofer systemSource icon: TVSource: TV analog output / DACConnection: RCAOutput connection: L/R speaker terminals + line-level sub outputTarget icon: speakersOutput: Passive speakers + powered subwoofer Passive 2.0 stereo systemSource icon: streamerSource: Streamer / DAC / phoneConnection: RCA or BluetoothOutput connection: Left and right speaker terminalsTarget icon: speakersOutput: Two passive speakersNote: A subwoofer is optional; the BT30D can operate as a conventional stereo amplifier.Technical SpecificationsInputs Feature Specification Bluetooth 5.0 Included RCA line input Included Outputs Feature Specification Stereo passive-speaker output Included Passive-subwoofer speaker output Included Line-level output for powered subwoofer Included Amplification Feature Specification Amplifier Chipset 2 × TI TPA3116D2 Maximum Main Output 50 W × 2 Maximum Subwoofer Output 100 W Speaker Impedance 2–8 Ω Subwoofer Cutoff Adjustment 20–200 Hz Connectivity and physical Feature Specification Bluetooth Range up to 15 m / 49 ft without obstacles Dimensions 118 × 132 × 35 mm Supplied Power Adapter 24 V / 4.5 A Additional Product ContentComparison: BT30D or BT30D Pro? Feature BT30D BT30D Pro Amplifier architecture 2 × TPA3116D2 TPA3255 Maximum output 50 W × 2 + 100 W 165 W × 2 + 350 W at 4 Ω DC input range Supplied 24 V / 4.5 A 12–36 V Best use Compact moderate-output 2.1 Higher-output 2.1 systems

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$79.90 - $98.17

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You have seen 24 out of 33 products

Fosi Audio: Powering Your Desktop Hi-Fi Experience

Fosi Audio is a dedicated innovator in the field of compact, high-fidelity audio equipment. Our mission is to make premium sound quality accessible to everyone, specializing in small, powerful, and highly efficient Mini Amplifiers and versatile Desktop Audio Components. Fosi Audio products are the perfect solution for upgrading your desktop, office, or small living room setup without breaking the bank.

⭐ The Core of Compact Power: Mini Amplifiers

The backbone of the Fosi Audio lineup is our selection of ultra-compact integrated amplifiers, built around efficiency and sound clarity.

High-Efficiency Class D Technology: Our amplifiers utilize cutting-edge Class D amplification to deliver substantial power output in a small footprint while maintaining minimal heat generation. This ensures clean, dynamic sound to drive passive bookshelf speakers.
Affordable Hi-Fi Performance: We focus on optimizing the audio signal path using quality components to achieve true high-fidelity sound, making audiophile performance accessible to entry-level users.
Plug-and-Play Simplicity: Designed for ease of use, our amplifiers and components require minimal setup, allowing users to quickly connect their PC, smartphone, or streamer to passive speakers.

🎧 Specialized Components for Sound Customization

Fosi Audio extends its product range beyond basic amplification to offer components that allow users to fine-tune their listening experience.

Tube Preamplifiers: Our popular line of Tube (Vacuum Tube) Preamps allows users to introduce the classic warmth, smoothness, and rich harmonics of tube audio into their digital systems, perfect for enthusiasts seeking a classic sound signature.
Headphone Amplifiers and DACs: We offer dedicated Headphone Amplifiers for driving high-impedance headphones and versatile DACs (Digital-to-Analog Converters) to bypass computer sound cards and improve digital source quality.

💡 Built for Modern Desktop Systems

Fosi Audio products excel in environments where space is limited but performance cannot be compromised.

Compact Footprint: The small, industrial metal chassis of our devices takes up minimal desk space, maintaining a clean and modern aesthetic.
Versatile Inputs: Products often feature a variety of inputs, including Bluetooth (AptX supported), RCA, and Optical/Coaxial, ensuring compatibility with almost any source, from turntables to smart TVs.

Choose Fosi Audio for reliable, powerful, and clean sound that proves great things—and great sound—come in small packages.

Fosi Audio Fosi Audio ZA3

Fosi Audio Fosi Audio Music Rhythm Visualizer Light

Fosi Audio Fosi Audio P4

Fosi Audio Fosi Audio IM4

Fosi Audio Fosi Audio DS3

Fosi Audio Fosi Audio ZH3

Fosi Audio Fosi Audio SP601

Fosi Audio Fosi Audio GR70

Fosi Audio Fosi Audio DS2

Fosi Audio Fosi Audio K5 Pro

Fosi Audio Fosi Audio SK02

Fosi Audio Fosi Audio PH05

Fosi Audio Fosi Audio T20X

Fosi Audio Fosi Audio T20

Fosi Audio Fosi Audio HT4S

Fosi Audio Fosi Audio P3

Fosi Audio Fosi Audio DS1

Fosi Audio Fosi Audio MC101

Fosi Audio Fosi Audio Q4

Fosi Audio Fosi Audio SK01

Fosi Audio Fosi Audio MC351

Fosi Audio Fosi Audio BT30D Pro

Fosi Audio Fosi Audio TB10D

Fosi Audio Fosi Audio BT30D