High performance ES9068AS*2 DAC  | THX AAA 788+ amplifier

Dual-mode clock management | QCC5124 Bluetooth

LDAC/aptX Adaptive and other high-res Bluetooth format support

App connectivity | Truly balanced design

Dual-voltage linear transformer | Variety of inputs and outputs

Note: The product layout is for reference only. All products shall prevail.

* Pictures are for reference only. The actual product may vary.

High-performance dual cores for soul- shaking sound

Two ES9068AS DACs handle the left and right channels, and make up the high-quality "core" of the K9. Listen to your favorite playlist and be instantly immersed in the music.

Selling Points

Connect via USB cable to a desktop or notebook computer

Immerse yourself in fabulous music

High-end amplifier Refreshingly capable

The FiiO K9's ace up its sleeve is the THX AAA 788+ amplifier, giving it an extraordinary 1% undistorted power output up to 780mW at 300Ω and up to 2000mW at 32Ω. No matter if you use low-impedance or high-impedance headphones, the K9 will drive it with aplomb. 

two DAC chips ES9068AS process the left and right channels respectively, and refine the "core" polishing quality and sound quality. Listen to your favorite playlist and revel in the beautiful singing in an instant.

high-performance double-core, sound into your heart

Precisely designed

From the DAC, to the volume adjustment, to the amplification, every part of the K9 is truly balanced for greatly reduced crosstalk and more authentic sound.

Fully balanced design music to your ears

The PCB of the K9 features a partitioned layout, fully separating the major sections of the audio circuit – the power supply, signals, and analog signal loop. This guarantees the integrity of the audio signal being processed.

Partitioned design for max performance of each section

The desktop-grade six-stage audio circuit was meticulously designed to ensure a pure, delicate yet rich sound. I/V conversion, LPF filter, digital volume adjustment, buffer amplifier, pre-amplifier, post-stage drive 

Six-stage audio circuit faithfully reproducing sound

Electricity is the mother of sound

The linear transformer is paired with 4 massive 4700uF capacitors to provide clean continuous power.

Robust power supply, ample power

The digital and analog portions of the K9 receive power separately to reduce interference between the two audio circuits, for pure and faithful reproduction of your music.

Isolated digital and analog section power supply, for purer sound

The power stabilization and filtering within the audio circuit plays a big part in ensuring excellent sound quality. Each stage of the audio circuit employs ultra-low-noise LDOs for voltage regulation.

Multiple LDOs in multiple stages, truly stable power

Dual-mode clock management,  even more improvement to sound

Accurate and stable dual-mode clock management allows the K9 to easily play back high-resolution audio with the greatest fidelity, as if you were there with the performing artists.


* Supports up to 768kHz/32bit PCM and DSD512

High-res Bluetooth Adept at all of your audiovisual needs

The K9 employs the QCC5124 Bluetooth chip with support for LDAC/aptX HD/aptX Adaptive and other high-res Bluetooth formats. With the K9, you can listen to music, watch videos, and play video games with high quality and low latency.


*Bluetooth 5.1, supported formats: LDAC/aptX Adaptive/aptX/aptX HD  aptX LL/AAC/SBC

Compatible with UAC 1.0/UAC2.0, highly adaptable

The K9 supports both UAC1.0 and UAC2.0 modes, allowing you to use the K9 with either devices that are simply plug-and-play or with devices that can work with the K9 with an additional driver for even better compatibility. And the FiiO Control App allows you to easily switch between UAC1.0 and UAC2.0 modes.


*UAC1.0 for PS5 and other device support

Comprehensively capable No matter where you look

Inputs: USB, optical, coaxial, RCA, 4.4mm


Five input signals: USB input/optical/coaxial LINE/Bluetooth


 *LINE mode includes RCA and 4.4mm input.  If both are connected, the 4.4mm input is prioritized.

Outputs: 6.35mm SE, 4.4mm balanced, XLR-4 balanced


Only the rear RCA+XLR analog outputs are active, at max output and cannot be adjusted by the volume knob;


Only the rear RCA+XLR analog outputs are active, and can be adjusted by the volume knob;


Only the front headphone outputs are active, and can be adjusted by the volume knob

file L:

L level for low gain is designed to better pair with sensitive in-ear earphones;

H file:

H level for high gain is designed to better drive lower sensitivity over-ear headphones.

Neatly handsome Horizontal or vertical

The K9 adopts the well-received design language of other FiiO desktop units, and features an all-aluminum construction made from an integrated stretching + CNC process to ensure the body's strength and precise finish. And with the vertical stand, the K9 can be used either vertically or horizontally, allowing it to become a versatile part of your desktop setup.

A weighty feel For a weighty sound

The iconic, weighty FiiO volume knob is powered by ADC curve reconstruction to allow you to precisely and smoothly adjust through 120 levels of volume, with minimal noise and volume deviation between the left and right channels. 

Light it up Let the high-res music commence

Not only do the RGB lights around the knobs give the K9 and the desk space around it some fun personality, they also conveniently indicate the current audio sampling rate and Bluetooth format.

Professional PEQ For what you love

Through the FiiO Control app, you can quickly switch between 7 music tuning styles preset on the K9. If the selected tuning style fits the music you are listening to, you can acquire a more vivid and pleasant experience. If the preset tuning style is not to your liking, the 3 self-define PEQ (Parametric Equalizer) designs will help to fine adjust to your favorite listening style.


*This function is only valid for Bluetooth decoding. 

To show off your skills

One app is enough

You can connect the K9 to your phone via Bluetooth, and with the addition of the FiiO Control app you get access to even more functionality. Adjust various settings such as filters, status indicators, EQ, and channel balance to exactly your liking.


*EQ only works in Bluetooth mode.

Multiple intelligent protection systems Always ready to go

Three intelligent protection systems – preventing overheating, overload, and DC protection – constantly make sure that the K9 delivers high-energy music without wearing itself out. Listen worry-free with the K9!

Connect to a phone via USB-B to Type-C cable

Connect to a phone, tablet, etc. via Bluetooth

Connect to a desktop digital player

Connect to external amplifiers or active speakers

Basic specifications:

Comparison table of the K series products

Abundant accessories

K9*1, Power cord*1, Headphone plug adapter*1, USB data cable*1, Feet pads*6, Fuse*1, Stand*1, Quick start guide*1, Voltage selection card*1, Warranty card*1