The FiiO K19 is a flagship desktop DAC, headphone amplifier and preamplifier built for demanding headphones, active speakers and full-size stereo systems. Dual ES9039SPRO DACs, an eight-channel THX AAA 788+ amplifier and a fully balanced signal path provide substantial output power with flexible source and output control.

USB, optical, coaxial, HDMI, HDMI ARC and Bluetooth inputs allow the K19 to serve computers, televisions, streamers and mobile devices. Its slim chassis can sit flat or vertically on the supplied stand, while 31-band PEQ provides unusually detailed system and headphone tuning.

Why it stands out

Dual ES9039SPRO flagship DAC architecture

Two eight-channel ESS DACs operate in a fully balanced design, supported by dual ACCUSILICON femtosecond oscillators and dedicated FPGA clock management.

Eight-channel THX AAA 788+ headphone amplifier

The balanced 4.4mm and XLR4 outputs deliver up to 8000mW + 8000mW at 32Ω in Ultra High Gain for demanding dynamic and planar-magnetic headphones.

HDMI input, HDMI pass-through and HDMI ARC

Use the K19 with a computer, game source, monitor or compatible television, in addition to conventional USB, optical, coaxial and Bluetooth audio sources.

31-band lossless PEQ and flexible system control

Fine-tune headphones or speakers with adjustable PEQ, custom presets and DSP tools through compatible desktop software, web control or the FiiO Control app.

Best for

• Flagship desktop headphone systems requiring high balanced output power
• Users who want one DAC for a computer, television and multiple digital sources
• Balanced stereo systems using XLR preamplifier or fixed line output
• Listeners who need detailed PEQ correction for headphones or room integration

Not ideal for

• Portable or battery-powered listening
• Driving passive speakers without a separate power amplifier
• Very small desks where a 250 × 225mm component is impractical
• Users who need analog audio input, network streaming or phono input built into the DAC

EMiUZEK Buying Notes

• The K19 is powerful enough to damage sensitive earphones or hearing at unsafe settings. Begin with Low Gain and low volume, then increase only as required.
• Choose the correct rear power selector for the connected supply: AC for the regional mains cable or DC for a compatible 10–16V supply; FiiO recommends 15V/3A or higher. Never connect an external DC supply outside the specified range.
• LO is fixed-level rear output and cannot be volume-controlled. Lower the downstream amplifier or active-speaker volume before selecting LO; use PRE when the K19 should control volume.
• HDMI ARC supports 44.1/48kHz PCM and depends on the television's ARC settings. It is not eARC multichannel decoding; set the TV to a compatible PCM output.

Frequently asked questions

What is the maximum balanced headphone output?

In Ultra High Gain, the 4.4mm and XLR4 outputs provide at least 8000mW + 8000mW at 32Ω and 1100mW + 1100mW at 300Ω under FiiO's stated test conditions.

Can I use sensitive IEMs with the K19?

Yes, but its very high power requires care. Select Low Gain, set a low maximum-volume limit and start playback at minimum volume.

Can it power passive speakers directly?

No. RCA or XLR output must feed an external power amplifier, integrated amplifier or active speakers.

What is the difference between PO, PRE, LO and PO+PRE?

PO sends adjustable audio to the front headphone outputs. PRE sends adjustable audio to the rear RCA/XLR outputs. LO sends fixed-level audio to the rear outputs. PO+PRE activates both front and rear adjustable outputs.

Can the three front headphone outputs work simultaneously?

They share the same priority and can output together, but FiiO does not recommend prolonged simultaneous use, especially with headphones of very different impedance.

Does HDMI ARC work with every television?

The TV must support ARC and be configured for HDMI ARC audio, normally PCM. HDMI compatibility varies by source and display, so confirm the TV's ARC settings if no audio is received.

What is the difference between HDMI IN and HDMI ARC?

HDMI IN receives audio and video from a source and passes video to a monitor through HDMI OUT. HDMI ARC receives compatible audio back from a television through the HDMI OUT (ARC) port.

Does the K19 support multichannel Dolby or DTS decoding?

It is a two-channel audio DAC and is not documented as a Dolby/DTS surround decoder. Configure the HDMI source or TV to output compatible stereo PCM.

Can I control TV volume with HDMI CEC?

FiiO does not specify full HDMI-CEC power and volume integration. Use the K19 knob, supplied remote or FiiO Control, and do not assume the TV remote will control every function.

What does the 31-band PEQ support?

It can adjust PCM signals from 44.1kHz to 192kHz without sample-rate conversion, with per-band gain and Q controls plus importable and exportable presets.

Can I use PEQ with every format and input?

PEQ availability depends on input, format, sample rate and firmware. Native DSD and signals outside the supported PCM range may not use the same processing path.

Does the K19 have analog inputs?

No. Its inputs are USB, coaxial, optical, HDMI, HDMI ARC and Bluetooth. RCA and XLR connectors on the rear panel are outputs.

Which Bluetooth codecs are supported?

Bluetooth 5.1 reception supports SBC, AAC, aptX, aptX LL, aptX HD, aptX Adaptive and LDAC when the source device supports the same codec.

What is the maximum USB decoding rate?

USB supports up to PCM 768kHz/32-bit and native DSD512 with compatible software, drivers and source material.

Does Windows require a driver?

Use the current FiiO USB driver on Windows 10 or 11 for full UAC2.0 capability. FiiO states that the K19 driver is not compatible with Windows 7 or 8.

Can it work with a PS5 or Nintendo Switch?

The K19 supports UAC1.0 driverless mode for compatible consoles. Select UAC1.0 when the source does not support its higher-rate UAC2.0 mode.

Can I connect a phone by USB?

Yes, with a compatible OTG cable and externally powered K19. Mobile USB audio behavior varies by phone and app, so universal compatibility is not guaranteed.

Can I use an external linear power supply?

Yes. Use a regulated 10–16V DC supply with a 5.5 × 2.1mm centre-positive plug; FiiO recommends 15V/3A or higher. Set the rear selector to DC before use.

Why is there no sound from the rear outputs?

Select PRE, LO or PO+PRE. If PO is selected, only the front headphone outputs are active. Also confirm the correct input and AC/DC power selector.

Can the K19 stand vertically?

Yes. Use the supplied support stand for vertical placement. For horizontal placement, apply the supplied foot pads and leave the ventilation areas unobstructed.

HOW TO CONNECT

Computer to balanced headphones

Source icon: Computer
Source: Windows PC / Mac
Connection: USB data cable
Output connection: 4.4mm or XLR4 balanced headphone output
Target icon: Headphones
Output: High-performance desktop headphone system

Note: Select USB input and PO output. Install the current FiiO driver on Windows and begin with a safe gain and volume setting.

TV audio through HDMI ARC

Source icon: TV
Source: Television with HDMI ARC
Connection: HDMI OUT (ARC) port
Output connection: Headphones or PRE output
Target icon: Headphones or stereo system
Output: Personal TV listening, amplifier or active speakers

Note: Enable ARC and compatible stereo PCM output on the TV, then select HDMI ARC input on the K19.

HDMI source with monitor pass-through

Source icon: Computer or media source
Source: PC / game source / media player
Connection: Source to HDMI IN; HDMI OUT to monitor
Output connection: Headphones, RCA or XLR
Target icon: Monitor and audio system
Output: Video pass-through with K19 audio decoding

Note: Select HDMI input and choose PO, PRE or LO according to the connected audio equipment.

Stereo preamplifier setup

Source icon: Digital source
Source: USB / optical / coaxial / HDMI / Bluetooth
Connection: Selected digital input
Output connection: RCA or balanced XLR in PRE mode
Target icon: Amplifier or active speakers
Output: Volume-controlled stereo system

Note: Use PRE for K19 volume control. Use LO only when the downstream component controls volume, and reduce its level before switching.

Technical Specifications

What's in the box, manuals and downloads

• FiiO K19 ×1
• Regional AC Power Cord ×1
• USB Data Cable ×2
• Infrared Remote Control ×1
• Vertical Support Stand ×1
• 3.5mm Trigger Cable ×1
• Foot Pad Set ×1
• Quick Start Guide ×1
• Warranty Card ×1

Visit the EMiUZEK download center.