FIIO K9 PRO DAC AK4499 Headphone Amplifier 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

FIIO K9 PRO DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA New
FiiO unveils with its K9 Pro an excellent DAC and headphone amplifier combo, using exclusively high-end audio components, renowned for their sonic performance, within a very precise assembly. The K9 Pro features a high-end AK4499 DAC, two THX-AAA 788+ amplifiers, a dual femtosecond clock, a QCC5124 Bluetooth receiver, an optimized power supply with fully balanced audio circuits.

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FiiO K9 Pro

DAC AK4499 Headphone Amplifier 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

FiiO unveils with its K9 Pro an excellent DAC and headphone amplifier combo, using exclusively high-end audio components, renowned for their sonic performance, within a very precise assembly. The K9 Pro features a high-end AK4499 DAC, two THX-AAA 788+ amplifiers, a dual femtosecond clock, a QCC5124 Bluetooth receiver, an optimized power supply with fully balanced audio circuits.

AK4499 DAC

The K9 Pro is equipped with the legendary AKM AK4499 DAC, renowned in the audiophile world for its excellent performance and decoding capabilities. It supports high-resolution audio streams up to PCM 32bit 384kHz and DSD256 and contributes greatly to the richness and precision of the K9 Pro's sound.

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

THX AAA Amplifier

The THX-AAA 788+ amplifiers used in the K9 Pro provide detailed and dynamic sound with both high and low impedance headphones. The K9 Pro can produce up to 46Vpp of transients when driving high-impedance loads, and up to 2W without distortion when driving low-impedance loads. Compared to the previous model, the output power of the K9 Pro has increased by more than 50% with better heat dissipation efficiency.

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Balanced architecture

Differential signals pass through the DAC, volume controller and amplifier, each with four channels, for a perfectly balanced design. Such an architecture ensures minimal interference between the different components to preserve all the details and the great dynamic variations of the music, for an unmatched sound quality.

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA
FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Separated circuits

The K9 Pro's PCB uses a partitioned design, in which not only the power supply and data signals are separated, but the analog circuitry is also placed in an independent section, ensuring the integrity of the processed audio signal.

Six-stage audio circuit

Every audio signal passes through a gigantic six-stage circuit to reproduce the music as faithfully as possible in every detail: I/V conversion, LPF filter, volume control, buffer amplifier, pre-amplification and output amplification.

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA
FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Linear power supply

The K9 Pro's linear power supply, with its low-frequency toroidal transformer and high-capacity Nichicon capacitors, provides a clean and perfectly stable power supply to the entire system.

Independent power supply for digital and analog circuits

The digital sections of the K9 Pro are powered separately from the analog sections, for effective protection against interference between the two circuits. This design results in an incredibly pure and clear sound.

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

LDOs for every audio circuit

While the high-performance transformer is an essential part of the K9 Pro's sound reproduction, special attention has also been paid to power stabilization and filtering in the audio circuit. At each stage of the audio circuit, ultra-low noise LDOs are used for voltage regulation. No cost has been spared to ensure a clean power supply, with the K9 Pro having a total of 20 LDOs!

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA
FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Dual femtosecond clocks

The latest generation of XMOS chips supports dual clock management technology. USB and Bluetooth decoding use two asynchronous femtosecond clocks, while optical and coaxial decoding use automatic PLL clocks. A more accurate clock management system makes it easier to handle any type of source and keep jitter extremely low.

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Lossless MQA decoding

The K9 Pro supports the decoding of MQA (Master Quality Authenticated) files, allowing you to listen to high-resolution audio files that are not only reasonably sized but also retain sound quality as close as possible to the original studio recording.

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA
FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

High quality Bluetooth

The K9 Pro features a Qualcomm QCC5124 chip for its Bluetooth 5.0 reception, supporting LDAC, aptX-HD and aptX Adaptive codecs. This chip ensures a fast and reliable Bluetooth connection, meeting the need for low latency for games and videos, as well as high data rate support for high resolution audio.

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

The importance of volume control

Volume control may seem like a simple concept, but proper execution of it is crucial to a perfect audio experience. The ADC curve reconstruction method for volume control used in the K9 Pro effectively minimizes any noise and imbalance between channels. It also results in smooth volume changes at all levels. This attention to the simple process of volume control is just one more step in ensuring that the K9 Pro delivers an exceptional sound experience.

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Extremely dynamic headphone output

Switch from high gain to medium or low gain to suit your exact needs when listening to your music on headphones, depending on the model and its impedance. Thanks to the hardware gain circuitry, even when listening at low gain on high-sensitivity headphones, dynamic range and musical fidelity are not compromised.

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

A refined and robust case

The K9 Pro's simple yet elegant chassis, made entirely of anodized and sandblasted aluminum, gives the device a clean, modern aesthetic. The controls are clearly defined to make the user experience as smooth as possible.

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA
FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

One color, one sample rate

The stainless steel knob integrates seamlessly with the K9 Pro's aluminum front panel, giving the device a truly luxurious aesthetic. An RGB LED indicator, surrounding the button, lights up in a different color depending on the sample rate of the file being played.

Quick access to all your sources

The front panel of the K9 Pro houses a series of metal buttons, allowing quick and easy access to all your sources, as well as adjusting the gain level to suit your listening and your headphones.

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Take control remotely

The integrated Bluetooth Low Energy (BLE) technology allows you to use the free FiiO Control mobile application to remotely operate all the functions of the K9 Pro, even if it is not in Bluetooth mode.

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

A rich connectivity

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA
1Balanced XLR 4 pins headphone output
2Single-ended Jack 6.35mm headphone output
3Balanced Jack 4.4mm headphone output
4Bluetooth antenna connector
5Coaxial input
6RCA line input
7USB-B input
8Optical input
9Balanced Jack 4.4mm input
10RCA Line output
11Balanced XLR output
12USB-C port

Technical characteristics

Specifications
Product typeDAC
Headphone amplifier
DAC ChipAK4499
InputsBluetooth
1x USB-B
1x Single-ended stereo RCA
1x Balanced Jack 4.4mm
1x Optical Toslink
1x Coaxial
Outputs1x Single-ended stereo RCA line output
1x Balanced stereo XLR line output
1x Single-ended Jack 6.35mm headphone output
1x Balanced Jack 4.4mm headphone output
1x Balanced XLR 4 pins headphone output
USB InterfaceXMOS XUF208
Bluetooth chipQCC5124
LPF2x OPA1612
Volume controller2x NJU72315
Amplification chip2x THX AAA788+
Channels balanceL12~R12 (0.5dB per level)
GainL (Low)
M (Medium)
H (High)
FiiO Control
Supported Bluetooth codecsAAC, SBC, aptX, aptX LL, aptX HD, LDAC, aptX Adaptive
Bluetooth codecs indicatorsSBC : Blue
AAC : Cyan
aptX HD : Yellow
aptX : Purple
aptX LL : Purple
LDAC : White
aptX Adaptive : Green
Supported sampling ratesUSB : PCM up to 32bit 384kHz, DSD up to DSD256
Coaxial : PCM up to 24bit 192kHz
Optical : PCM up to 24bit 96kHz
Recommended headphone impedance16~600Ω
Single-ended line output performances
THD+N< 0.0007% (1kHz/10kΩ/dBA)
SNR≥ 123dB (dBA)
Crosstalk≥ 110dB (1kHz/10kΩ)
Noise floor< 1.9µV (dBA)
Frequency response20Hz~20kHz (-3dB)
Line level2.5Vrms (1kHz/10kΩ)
Balanced line output performances
THD+N< 0.0004% (1kHz/10kΩ/dBA)
SNR≥ 128dB (dBA)
Crosstalk≥ 123dB (1kHz/10kΩ)
Noise floor< 1.9µV (dBA)
Frequency response20Hz~20kHz (-3dB)
Line level5Vrms (1kHz/10kΩ)
Single-ended headphone output performances (Jack 6.35mm)
Output power≥ 1.1W @ 16Ω, THD+N < 1%, AUX IN
≥ 2W @ 32Ω, THD+N < 1%, AUX IN
≥ 278mW @ 300Ω, THD+N < 1%, AUX IN
Output impedance< 1Ω (32Ω)
Crosstalk≥ 75dB (1kHz, 32Ω, AUX IN)
THD+N< 0.0005% (1kHz/32Ω/dBA)
Noise floor< 2µV(dBA)
SNR≥ 123dBA
Frequency response20Hz~20kHz (-3dB)
Max output voltage> 256Vp-p
Balanced headphone output performances (Jack 4.4mm, XLR4)
Output power≥ 1.1W @ 16Ω, THD+N < 1%, AUX IN
≥ 2W @ 32Ω, THD+N < 1%, AUX IN
≥ 278mW @ 300Ω, THD+N < 1%, AUX IN
Output impedance< 1Ω (32Ω)
Crosstalk≥ 114dB (1kHz, AUX IN)
THD+N< 0.0004% (1kHz/32Ω/dBA)
Noise floor< 3µV(dBA)
SNR≥ 123dBA
Frequency floor5Hz~50kHz (-3dB)
Max output level>51Vp-p
General
Supply voltage110-115VAC / 220-230VAC
Dimensions
Weight~2750g
Case materialAluminum
ColorBlack

Frequency response curve 1

Test conditions : Linear input, -5dB sinusoidal signal, high gain, 20Hz-20kHz, single-ended output (load 32Ω)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Frequency response curve 2

Test conditions : Linear input, -5dB sinusoidal signal, high gain, 20Hz-20kHz, balanced output (load 32Ω)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Frequency response curve 3

Test conditions : balanced input Jack 4.4mm, -5dB sinusoidal signal, high gain, 20Hz-20kHz, single-ended output (load 32Ω)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Frequency response curve 4

Test conditions : balanced input Jack 4.4mm, -5dB sinusoidal signal, high gain, 20Hz-20kHz, balanced headphone output (load 32Ω)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Frequency response curve 5

Test conditions : Coaxial/Optical input, -5dB sinusoidal signal, high gain, 20Hz-20kHz, single-ended output (load 32Ω)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Frequency response curve 6

Test conditions : Coaxial/Optical input, -5dB sinusoidal signal, high gain, 20Hz-20kHz, balanced headphone output (load 32Ω)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Frequency response curve 7

Test conditions : Coaxial/Optical input, -5dB sinusoidal signal, high gain, 20Hz-20kHz, single-ended line output (load 10kΩ)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Frequency response curve 8

Test conditions : Coaxial/Optical input, -5dB sinusoidal signal, high gain, 20Hz-20kHz, balanced line output (load 10kΩ)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Frequency response curve 9

Test conditions : USB DAC/BT input, -5dB sinusoidal signal, high gain, 20Hz-20kHz, single-ended output (load 32Ω)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Frequency response curve 10

Test conditions : USB DAC/BT input, -5dB sinusoidal signal, high gain, 20Hz-20kHz, balanced headphone output (load 32Ω)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Frequency response curve 11

Test conditions : USB DAC/BT input, -5dB sinusoidal signal, high gain, 20Hz-20kHz, single-ended line output (load 10kΩ)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Frequency response curve 12

Test conditions : USB DAC/BT input, -5dB sinusoidal signal, high gain, 20Hz-20kHz, balanced line output (load 10kΩ)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Distortion diagram of curves 1

Test conditions : Linear input, Vin=480mVrms, high gain, single-ended output (load 32Ω)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Distortion diagram of curves 2

Test conditions : Linear input, Vin=480mVrms, high gain, balanced headphone output (load 32Ω)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Distortion diagram of curves 3

Test conditions : balanced input Jack 4.4mm, Vin=3Vrms, high gain, single-ended output (load 32Ω)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Distortion diagram of curves 4

Test conditions : balanced input Jack 4.4mm, Vin=2.4Vrms, high gain, balanced headphone output (load 32Ω)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Distortion diagram of curves 5

Test conditions : Coaxial/Optical input, Vin=480mVrms, high gain, single-ended output (load 32Ω)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Distortion diagram of curves 6

Test conditions : Coaxial/Optical input, Vin=480mVrms, high gain, balanced headphone output (load 32Ω)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Distortion diagram of curves 7

Test conditions : Coaxial/Optical input, Vin=0.8Vrms, high gain, single-ended line output (load 10kΩ)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Distortion diagram of curves 8

Test conditions : Coaxial/Optical input, Vin=700mVrms, high gain, balanced line output (load 10kΩ)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Distortion diagram of curves 9

Test conditions : USB DAC/BT input, signal sinusoïdal -3dB, high gain, 48kHz, 20Hz-20kHz, single-ended output (load 32Ω)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Distortion diagram of curves 10

Test conditions : USB DAC/BT input, signal sinusoïdal -3dB, high gain, 48kHz, 20Hz-20kHz, high gain, balanced headphone output (load 32Ω)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Distortion diagram of curves 11

Test conditions : USB DAC/BT input, signal sinusoïdal -3dB, high gain, 48kHz, 20Hz-20kHz, high gain, single-ended line output (load 10kΩ)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA

Distortion diagram of curves 12

Test conditions : USB DAC/BT input, signal sinusoïdal -3dB, high gain, 48kHz, 20Hz-20kHz, high gain, balanced line output (load 10kΩ)
Red : left channel / Blue : right channel

FiiO K9 Pro DAC AK4499 Amplificateur Casque 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA
The K9 Pro's linear power supply, with its low-frequency toroidal transformer and high-capacity Nichicon capacitors, provides a clean and perfectly stable power supply to the entire system.The K9 Pro's linear power supply, with its low-frequency toroidal transformer and high-capacity Nichicon capacitors, provides a clean and perfectly stable power supply to the entire system.The K9 Pro's linear power supply, with its low-frequency toroidal transformer and high-capacity Nichicon capacitors, provides a clean and perfectly stable power supply to the entire system.
 
Data sheet
InputBluetooth
InputRCA
InputOptical
InputJack 4.4mm
InputUSB
InputSPDIF
OutputRCA
OutputJack 6.35mm
OutputXLR
OutputJack 4.4mm
DAC / ADC ChipAK4499
Max sampling rateDSD256
Max sampling rate384kHz
Max sampling rateMQA
ColorBlack
NetworkingNo
Remote ControlN/A
 
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FIIO K9 PRO DAC AK4499 Headphone Amplifier 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA
FiiO unveils with its K9 Pro an excellent DAC and headphone amplifier combo, using exclusively high-end audio components, renowned for their sonic...

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