Fiio K9 Pro Desktop DAC & Amplifier (Black)

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The new Fiio K9 Pro is designed to be uncompromising as both an amp and a DAC. Its outstanding performance will ensure you want to leave a spot for the K9 Pro in your collection of audio gear.

Legendary AK4499
The K9 Pro is equipped with the legendary AKM AK4499, renowned in the audio industry for its exceptional performance and unparalleled decoding capabilities, supporting up to 384 kHz and native DSD256 audio. And given its current scarcity, it is definitely a chip many are eager to experience.


THX AAA amplifier technology
The THX AAA 788+ chips used in the K9 Pro provide exemplary details and dynamics no matter if you are using low or high-impedance headphones. The K9 Pro can output up to 46Vpp transients when driving high-impedance loads, and up to an undistorted 2W* when pushing low-impedance loads. Compared to the original, the output power of the K9 Pro has increased by more than 50% with higher heat dissipation efficiency. *As tested in FiiO Labs under balanced out

Fully differential, truly balanced design
Fully differential signals go through the four-channel DAC, four-channel volume adjustment, and four-channel amp for a truly balanced design. Such a design ensures minimal interference between different components in order to fully maintain all details and large dynamic swings in music for unmatched sound quality.

Clearly partitioned for smooth signal transmission
The PCB of the K9 Pro uses a partitioned layout, wherein not only the power supply and signals are separated, but the analog signal loop is also put in an independent section, guaranteeing the integrity of the audio signal being processed.

Six-stage audio circuit that holds up to scrutiny
Every audio signal goes through a mammoth 6-stage circuit to reproduce music as faithfully as possible with every last detail.
I/V conversion, LPF filter, volume control, buffer amplifier, pre-amplification, output-amplification

Linear power supply
The K9 Pro's linear power supply, with its low-frequency transformer and high-capacity Nichicon capacitors, provides abundant clean power for the whole system.

Isolated digital and analog power delivery
The digital portions of the K9 Pro receive power separately from the analog portions, for effective shielding against audio interference between the two circuits. Such a design leads to a highly pure, clean sound.

LDOs for each audio circuit stage
While the special high-performance transformer is important to the K9 Pro's phenomenal sound, special attention was also paid to the power stabilization and filtering within the audio circuit. In each stage of the audio circuit, ultra-low-noise LDOs are employed for voltage regulation. No expense was spared in ensuring clean power supply, with the K9 Pro in total having a substantial amount of 20 LDOs!

Dual femtosecond clocks of excellence
The newest generation of XMOS chips supports dual-mode clock management technology. Under USB and Bluetooth decoding dual asynchronous femtosecond clocks are used, while under optical and coaxial decoding automatic PLL clocks are employed. A more precise clock management system makes it easier to handle any kind of source and maintain the maximum quality possible.

Lossless MQA decoding
The K9 Pro supports the unfolding of MQA tracks, allowing you to listen to high-resolution audio files that are not only reasonably sized, but also retain master-level sound quality that brings you directly into the recording studio.

Fast and reliable hi-res Bluetooth
The K9 Pro employs the Qualcomm QCC5124 to handle Bluetooth duties, with support for formats such as LDAC, aptX HD and aptX Adaptive. This chip ensures that Bluetooth connections are both reliable and quick, satisfying both the low latency needs for games/videos and the high bitrate necessary for high resolution audio. Bluetooth format support: AAC/SBC/aptX/aptX LL/aptX HD/LDAC/aptX adaptive

Essentiality of volume adjustment
Adjusting the volume may look like a simple concept, but a good execution of it is crucial to an excellent audio experience. The ADC curve reconstruction method of volume adjustment used in the K9 Pro effectively minimizes any left-right channel volume imbalance and noise. It also results in a smooth change of volume across all levels. This attention paid to the simple process of volume adjustment is just another layer to making sure you truly savor your music with the K9 Pro.

Headphones come alive with a good source
Switch between high, medium, and low gain to fit exactly your needs when listening to your particular pair of headphones. Thanks to the pure hardware gain circuit, even when listening at low gain with high-sensitivity headphones both dynamic range and musical fidelity remain uncompromised.

Perfection exemplified
The simple, yet elegant all-aluminum black exterior is anodized and finely sandblasted with painstaking craftsmanship for a textured, luxurious feel. Controls are clearly and intuitively laid out to make operating the device as smooth as possible. Rest assured, the K9 Pro is the very definition of a reliable and loyal music partner in your home.

Lighting up the mood
The stainless-steel volume knob blends seamlessly with the aluminum alloy front panel to give a luxurious experience while controlling your music. The RGB indicator lights surrounding the volume knob can light up differently depending on the currently playing sampling rate.

Switch quickly to your music
Easy-to-use metal switches are used for controlling input selection and gain level to help you easily and quickly switch to your desired method of listening.

Rich sound from plentiful connectors
Front: XLR 4-pin, 4.4mm balanced, 6.35mm single-ended headphone outputs
Rear: 4.4mm balanced Line In; coaxial, optical, RCA, XLR out; for more convenient connections to external amps and speakers
Side: USB Type-C port

A true Renaissance man

Connect to home audio setup (desktop USB audio + active HiFi speakers)
Connect to mobile devices (players, computers)
Drive power-hungry headphones (desktop USB audio + headphones)
RCA+XLR balanced line out (for active speakers, monitor speakers, external amplifiers)
*When connected via Line out, you can quickly switch between fixed and variable output.
Side-mounted Type-C port for easy connection to mobile devices
Rear 4.4mm balanced Line in

App-controllable desktop amp
Built-in Bluetooth Low Energy (BLE) technology allows you to use the FiiO Control App to control functions like channel balance, sleep timer, etc. at any time, even when not in Bluetooth mode.

Key Features

  • Flagship AK4499 DAC chip
  • XMOS XUF208
  • Qualcomm QCC5124 BT Chipset
  • MQA Decoding Support
  • Headphone Out (6.35mm Single-Ended/4.4mm Balanced/4-pin XLR).
  • MQA Decoding Support
  • Customised THX AAA Amplification Module
  • Hi-res PCM Decoding up to 32-Bit/768kHz. (USB Input)
  • DSD Support up to DSD512 natively. (USB Input)
  • Optical/Coaxial Input supports PCM up to 192kHz and DoP64
  • Hi-End Parameters & Configuration
  • Hi-resolution Bluetooth Support with latest Qualcomm QCC51xx Series Chip
  • LDAC/AptX Adaptive/AAC/SBC and other hi-res Bluetooth Codec Support
  • Digital Inputs: Bluetooth/Coaxial/Optical/USB
  • Analog Input: 4.4mm/RCA
  • Lineout: RCA, Balanced XLR
  • Three-Level Gain Mode: Low, Medium, High
  • Linear Power Supply
  • Adjustable Volume Knob with backlight(for indicating active sample rate)
  • Multi-state selection & indication
General specifications
Name / Model No. K9 Pro Hardware solution

DAC: AK4499, USB: XMOS XUF208, Bluetooth: QCC5124, LPF: OPA1612 * 2,

volume IC: NJU72315 * 2, AMP: THX AAA788+ * 2, linear transformer

Color Black Volume Scroll Potentiometer+ADC Sampling
Weight ≈2750g Channel balance L12~R12 (0.5dB per level)
Gain L/M/H FiiO Control Surpported
Bluetooth format indication Surpported Sampling rate indication Surpported
Firmware upgrade System firmware and Bluetooth version can be upgraded via USB Deep standby Long press the multi-function button for about 3s
Low battery reminder /    
Bluetooth transmission / Bluetooth receiver (5.0) AAC/SBC/aptX/aptX LL/aptX HD/LDAC/atpX Adaptive
Bluetooth format indicator SBC: blue, AAC: cyan, aptX HD: yellow, aptX: purple, aptX LL: purple, LDAC: white, atpX Adaptive: green Charging indicator /
Maximum supported sampling rate 384kHz-32bit/DSD256(USB DAC) Recommended headphone impedance 16~600 Ω
192kHz-24bit (coaxial)
96KHz-24bit (optical)
Buttons and interfaces
Button Physical key + toggle switch USB Type-C, USB B (data transmission)
Single-ended line input interface RCA socket Balanced line input interface 4.4mm balanced socket
Spdif in Optical fiber socket Digital coaxial input interface RCA socket
Balanced output interface 4.4mm socket, XLR4 balanced socket Headphone output interface Standard 6.35 mm socket
Balanced line output interface XLR3 balanced socket Single-ended line output interface RCA socket
Power parameters
Power supply AC 110-115V~/AC 220-230V~ (Recommended) Battery capacity /
Charging time / PO battery life /

1 year warranty from date of purchase. Headphones SG is a Fiio authorised reseller. All Fiio products purchased through Headphones SG is eligible for warranty.