Fiio K9 Desktop DAC and Headphone Amplifier

Fully featured and impressively powerful - the Fiio K9 is a desktop centerpiece!

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High performance dual DACs for soul-shaking sound

The Fiio K9 features two ES9068AS DACs for 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 - with support for up to 768kHz PCM and DSD512 sample rates.

Capable high-end amplifier

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. At the same time, an impressively low noise floor, smooth digital volume control and 3 gain settings mean that even sensitive IEMs work well with the K9.

Portioned layout for max performance

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.

Dual-mode clock management

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.

High-Res Bluetooth Receiver

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 connect your phone or other music source via Bluetooth and listen to music, watch videos, and play video games with high quality and low latency.

  • High performance DAC ES9068AS*2
  • THX AAA 788+ Tech
  • App Control
  • Dual femtosecond clocks
  • QCC5124 Bluetooth Chip
  • Truly Balanced Design
  • Linear Power Supply
  • Supports LDAC / aptX / Adaptive aptX bluetooth receiving

General Specifications

Name K9
Colour Black
Weight Approx. 2660g
Gain L/M/H
Size 200x224.5x72mm (excluding foot pads)
Deep standby Long press the multi-function key for about 3 seconds
Bluetooth format indicator SBC: blue, AAC: cyan, aptX HD: yellow, aptX: purple, aptX LL: purple, LDAC: white, atpX Adaptive: green
Sample rate support
  • 768kHz-32bit/DSD512(USB DAC)
  • 192kHz-24bit (coaxial)
  • 96kHz-24bit (optical)


Hardware solution

DAC:ES9068A * 2


Bluetooth: QCC5124,LPF:OPA1612 * 2,

Volume IC:NJU72315 * 2

AMP:THX AAA788 + * 2

Transformer: Linear Transformer

Volume control type analog potentiometer (ADC sampling)
Channel balance L12 ~ R12 (0.5dB per stage)
FiiO Control Supported
Sample Rate Indicator Supported
Firmware upgrade The system firmware and Bluetooth version can be upgraded through USB
Bluetooth Reception (5.1) AAC/SBC/aptX/aptX LL/aptX HD/LDAC/atpX Adaptive
Supported Impedance 16~600 Ω


Inputs and Outputs

Buttons Solid key + toggle switch
Analog line input RCA, 4.4mm balanced
Digital input Optical, Coaxial
USB-input  USB-B
Headphone output 6.35mm unbalanced, 4-pin XLR / 4.4mm balanced
Line outputs RCA, 3 pin XLR


Audio parameters

Single-ended Line Output:
THD+N <0.00026%(1kHz/10 kΩ/A weighting) signal-to-noise ratio ≥ 119dB (A weight)
channel separation ≥ 111dB (1kHz/10 kΩ) noise floor <2.9 μV(A weighting)
frequency response 20Hz~50kHz (-1.5dB) line output level 2.4Vrms (1kHz/10kΩ)
Performance Parameters of Balanced Line Output
THD+N <0.00025%(1kHz/10 kΩ/A weighting) signal-to-noise ratio ≥ 124dB (A weight)
channel separation ≥ 120dB (1kHz/10 kΩ) noise floor <3.1 μV(A weighting)
frequency response 20Hz~50kHz (-1.5dB) line output level 4.8Vrms (1kHz/10kΩ)
Headset Output Parameters (6.35mm)
Output Power 1 ≥1W(16Ω / THD+N<1%,AUX/UAC/SPDIF/BT IN) output impedance <1 Ω(32 Ω)
Output Power 2 ≥1.5W(32Ω /THD+N<1%,AUX/UAC/SPDIF/BT IN) channel separation ≥ 75dB (1kHz/32 Ω)
Output Power 3 ≥200mW(300Ω / THD+N<1%,AUX IN) distortion plus noise <0.00028% (1kHz/32 Ω/A weighting)
noise floor <4.8 μV(A weighting) signal-to-noise ratio ≥ 124dB (A weight)
frequency response 20 Hz~50kHz (-1.5dB) peak output voltage >21Vp-p
Balanced Headphone Output (4.4mm/XLR4)
Output Power 1 ≥1W(16Ω / THD+N<1%,AUX/UAC/SPDIF/BT IN) output impedance <1 Ω(32 Ω)
Output Power 2 ≥2W(32Ω / THD+N<1%,AUX/UAC/SPDIF/BT IN) channel separation ≥ 114dB (1kHz/32 Ω)
Output Power 3 ≥780mW(300Ω / THD+N<1%,AUX IN) distortion plus noise <0.00029% (1kHz/32 Ω/A weighting)
noise floor <7.1 μV(UAC, gain m, maximum volume) signal-to-noise ratio ≥ 119dB (A weight)
frequency response 20Hz~50kHz (-1.5dB) peak output voltage >42Vp-p

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