90%
FiiO K9
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
* Pictures are for reference only. The actual product may vary.
Note: The product layout is for reference only. All products shall prevail.
Selling Points
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.
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.
Precisely designed
Fully balanced design music to your ears
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.
Partitioned design for max performance of each section
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.
Six-stage audio circuit faithfully reproducing sound
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
Electricity is the mother of sound
Robust power supply, ample power
The linear transformer is paired with 4 massive 4700uF capacitors to provide clean continuous power.
Isolated digital and analog section power supply, for purer sound
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.
Multiple LDOs in multiple stages, truly stable power
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.
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
Outputs: 6.35mm SE, 4.4mm balanced, XLR-4 balanced
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.
LO:
Only the rear RCA+XLR analog outputs are active, at max output and cannot be adjusted by the volume knob;
PRE:
Only the rear RCA+XLR analog outputs are active, and can be adjusted by the volume knob;
PO:
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!
Immerse yourself in fabulous music
Connect via USB cable to a desktop or notebook computer
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
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
Dealers selling FiiO near you
FiiO K9 — Refined desktop all‑in‑one
The FiiO K9 pairs class-leading value with a surprisingly high level of technical polish for its price, delivering excellent resolution, a very quiet background and lively dynamics in a compact desktop DAC/amp. Reviewers praised its combination of dual DAC chips and a modern USB controller as a performance-minded package that trims features compared with the Pro model while keeping core sonic strengths. As Audiophilepure highlighted, the K9 is a technically impressive unit for the money, and Sandu Vitalie / Soundnews scored it highly for resolution, noise floor and value. Build quality and finish feel premium for the tier, making the K9 a compelling choice for desktop listeners who want refined detail retrieval and low noise without the Pro's premium price.
Pros
- Exceptional price-to-performance — positioned as a compelling alternative to the Pro with strong value at ~$500.
- Very low noise floor and high resolution, delivering clear detail retrieval suitable for sensitive IEMs and critical listening.
- Engaging dynamics and solid transient grip for the class, providing lively, controlled bass and articulate mids.
- Well-executed build and refined aesthetic—lightweight yet robust construction that feels premium for the price tier.
&
Cons
- No MQA support, a deliberate omission compared with the K9 Pro.
- Slightly reduced output power versus the Pro, so it may not be ideal for the most power-hungry planar headphones.
- Trims some connectivity options (no side USB-C OTG port), reflecting a more conservative feature set.
Sound Quality
90/100
Soundnews rated dynamics highly (89/100) and reviewers noted the unit retains good punch and transient grip despite using lower-grade DAC chips versus the Pro model. While not described as reference-level slam, the K9 delivers lively, engaging dynamics for most desktop listening.
Noise Floor
92/100
Soundnews explicitly scores the Noise Floor very highly (95/100) and Audiophilepure gives no hint of hiss; both imply a very quiet background. This places the K9 in the 'black background' territory suitable for the vast majority of IEMs and headphones.
Headphone Compatibility
85/100
Reviews note slightly reduced power versus the K9 Pro ('power went down by a little bit'), suggesting the K9 is aimed at a broad range of headphones but not the absolute most power-hungry planars. With no reviewer-reported output-impedance or specific drive limitations, it appears well-suited to most full-size cans and sensitive IEMs but probably not a universal reference for hardest-to-drive models.
Build Quality
90/100
Both reviews highlight solid construction and a refined aesthetic (Audiophilepure: similar yet slightly modified aesthetic; Soundnews: Build Quality 91/100). The unit is noted as slightly lighter with a modified PSU implementation, indicating good component choices and execution for the price tier.
Features Connectivity
85/100
The K9 includes a modern USB controller (XUF308) and dual DAC chips, so it ships as a capable all-in-one desktop DAC/amp at $500, but it drops some features compared with the Pro: no MQA support and no side USB-C OTG port. Those omissions keep the feature set slightly conservative but still well-rounded for the segment.
Value for Money
94/100
Both reviewers frame the K9 as a very compelling value at roughly $500 (Audiophilepure: 'pleasant surprise' and much cheaper than the K9 Pro; Soundnews: Value 94/100). Given the performance and feature trade-offs versus a higher-priced Pro model, reviewers explicitly praise its price-to-performance proposition.
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