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The Fosi Audio ZH3 is a precision-engineered desktop headphone amplifier designed for audiophiles who demand both raw power and sonic delicacy. Utilizing a fully balanced circuit design, the ZH3 significantly reduces noise interference and crosstalk, delivering a clean, expansive soundstage that brings your high-resolution audio to life.
Massive Output: Equipped with both 6.35mm single-ended (640mW@32Ω x2) and 4.4mm balanced (2570mW@32Ω x2) outputs. The 3-level gain switch supports headphones ranging from 16Ω to 300Ω, making it perfect for almost in-ears and over-ear headphones.
Gain Switch: Features High/Low gain settings to ensure a perfect match for everything from sensitive In-Ear Monitors (IEMs) to power-hungry over-ear cans, maintaining a black background without hiss.
Comprehensive Inputs: Equipped with XLR Balanced and RCA Unbalanced inputs, making it compatible with high-end DACs and professional audio interfaces.
Triple Headphone Outputs: Supports 4.4mm Balanced, 4-pin XLR Balanced, and 6.35mm Single-ended outputs, catering to all your premium cable terminations without the need for adapters.
Vintage VU Meter: The front panel features a classic, warm-lit VU meter that provides real-time visual feedback of the audio signal levels, adding a touch of timeless "Analog" soul to your modern desktop.
Aviation-Grade Chassis: CNC-machined from solid aluminum, the enclosure not only looks premium but also provides excellent EMI/RFI shielding to protect the sensitive internal circuitry.
| Component | Specification |
| Input Type | XLR Balanced, RCA Unbalanced |
| Output Type | 4.4mm Bal, 4-pin XLR Bal, 6.35mm SE |
| Frequency Response | 20Hz - 20KHz (±0.1dB) |
| SNR | ≥ 120dB (Balanced) |
| THD+N | < 0.0005% |
| Output Impedance | < 0.1Ω |
| Compatible Headphone Impedance | 16Ω - 600Ω |
The Fosi Audio ZH3 bridges the gap between vintage charm and modern performance. While many amplifiers prioritize specs alone, the ZH3 focuses on the musicality and control of the driver. Its low output impedance ensures a high damping factor, providing tight, controlled bass and crystalline highs. Whether as the centerpiece of your office setup or a dedicated headphone station, the ZH3 offers a reference-level listening experience at an unbeatable value.
All-in-One Desktop HiFi DAC/Headphone Amp/Preamp
With comprehensive input and output options, the ZH3 functions as a DAC, headphone amplifier, and preamp, which can be connected to IEMs, over-ear headphones, active speakers, and amplifiers. Featuring UAC 1.0 and 2.0, it is also compatible with gaming consoles, ensuring seamless connectivity across multiple desktop devices.
XMOS+AKM decoding with 4 high-performance dual op-amps deliver
clarity, precision, and transparency.
Flagship Chipset
With 1.9uV noise floor and 117dB crosstalk for clearer separation of vocals
and instruments.
Circuit Diagram
Delivering up to 2570mW per channel into 32 ohms(4.4 mm), far overkill formain
stream headphones.
Power Beast
Delivers strong control to handle both lEMs and over-ear headphones from16Q to 300Q with ease.
Dual Headphone Outputs
Cohesive family aesthetics, pairing effortlessly with ZD3 and ZA3 for a matching HiFi ensemble.
Z-Series Family
When switching outputs, it adjusts to previous level for safe transitionsbetween different devices.
Volume Memory
Responsive LCD with all panel controls integrated for clear information and
a minimalist look.
1.5-Inch LCD Display
Provides +12dB bass adjustment and +10dB treble adjustment to
createyour own personalized tuning.
Bass & Treble
Enjoy a very clean, noise-free listening experience by
bypassing the tonecontrol circuit.
Bypass Mode
Easily control audio sources and playback devices, adjust bass and
trebleselect 6 filters, etc.
IR Remote
Auto power off after 30 minutes of no signal, for energy savings and peace
of mind.
Auto Power Off
Enables synchronized on/off with audio setups, automating seamless
system control.
12V Trigger
If your PC is running Windows 7 or earlier. (Note: Windows 7 is no longer updated and may have compatibility issues. Using ZH3 with Windows 7 is not recommended.); To play DSD tracks. (Note: If you use Foobar with the built-in WASAPI plugin for DSD playback, no driver is needed.); To play PCM 768kHz tracks.
Faulty or loose USB connection—try a different USB cable; Computer malfunction—try connecting to another computer; Malfunctioning USB port—try another USB port; ZH3 is not set to USB input mode; Driver conflict—go to "Device Manager," find "Audio Inputs and Outputs," uninstall the ZH3 driver, reinstall it, reboot your computer, then reconnect the ZH3 via USB.
USB Input--R/X or LO output: EQ, Bypass, and Gain adjustment not supported; Optical/Coaxial Input--PO output: UAC switching not supported; Optical/Coaxial Input--R/X or LO output: EQ, Bypass, Gain, and UAC switching not supported; RCA Input--PO output: UAC switching and Filter not supported; RCA Input--R/X or LO output: Only input and output selection available.
The ZH3 supports the replacement of two op-amp chips. It utilises easily replaceable DIP8 dual-channel discrete op-amps, catering to your pursuit of a personalised audio experience. Compatible models include the LME49720, NE5532, MUSES02, SS3602, and others. For detailed video tutorials, please consult customer service.
