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[GRADE B] FIIO K9 PRO ESS DAC 2x ES9038PRO Headphone Amplifier 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA
FiiO unveils an update to its K9 Pro, a 2x ES9038PRO DAC and headphone amplifier combo that uses only high-end audio components known for their sonic performance in a precision assembly. The K9 Pro features a dual high-end DAC, two THX-AAA 788+ amplifiers, dual femtosecond clocks, a QCC5124 Bluetooth receiver, an optimised power supply and fully balanced audio circuits.
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Accessories for this product
Find here a selection of useful and/or essential accessories for this product. These are specially selected by the Audiophonics team according to the characteristics of the product.
Refurbished product - Grade B
Slight traces of handling on the chassis. Letter "O" of the "Pro" logo on the front panel broken (aesthetic defect).
FiiO K9 Pro ESs
2x DAC ES9038PRO Headphone Amplifier 2x THX-AAA 788+ Bluetooth aptX-HD LDAC 32bit 384kHz DSD256 MQA
FiiO unveils an update to its K9 Pro, a 2x Es9038PRO DAC and headphone amplifier combo that uses only high-end audio components known for their sonic performance in a precision assembly. The K9 Pro features a dual high-end DAC, two THX-AAA 788+ amplifiers, dual femtosecond clocks, a QCC5124 Bluetooth receiver, an optimised power supply and fully balanced audio circuits.
Dual DAC ES9038PRO
The K9 Pro is equipped with an ESS ES9038PRO Dual 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 accuracy of the K9 Pro ESS.
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.
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.
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.
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.
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!
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.
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.
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.
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.
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.
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.
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.
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.
A rich connectivity
| 1 | Balanced XLR 4 pins headphone output |
| 2 | Single-ended Jack 6.35mm headphone output |
| 3 | Balanced Jack 4.4mm headphone output |
| 4 | Bluetooth antenna connector |
| 5 | Coaxial input |
| 6 | RCA line input |
| 7 | USB-B input |
| 8 | Optical input |
| 9 | Balanced Jack 4.4mm input |
| 10 | RCA Line output |
| 11 | Balanced XLR output |
| 12 | USB-C port |
The LINE IN input can only be used with the headphone outputs.
Technical characteristics
| Specifications | |
|---|---|
| Product type | DAC Headphone amplifier |
| DAC Chip | 2x ESS ES9038PRO |
| Inputs | Bluetooth 1x USB-B 1x Single-ended stereo RCA 1x Balanced Jack 4.4mm 1x Optical Toslink 1x Coaxial |
| Outputs | 1x 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 Interface | XMOS XUF208 |
| Bluetooth chip | QCC5124 |
| LPF | 2x OPA1612 |
| Volume controller | 2x NJU72315 |
| Amplification chip | 2x THX AAA788+ |
| Channels balance | L12~R12 (0.5dB per level) |
| Gain | L (Low) M (Medium) H (High) |
| FiiO Control | |
| Supported Bluetooth codecs | AAC, SBC, aptX, aptX LL, aptX HD, LDAC, aptX Adaptive |
| Bluetooth codecs indicators | SBC : Blue AAC : Cyan aptX HD : Yellow aptX : Purple aptX LL : Purple LDAC : White aptX Adaptive : Green |
| Supported sampling rates | USB : PCM up to 32bit 384kHz, DSD up to DSD256 Coaxial : PCM up to 24bit 192kHz Optical : PCM up to 24bit 96kHz |
| Recommended headphone impedance | 16~600Ω |
| 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 response | 20Hz~20kHz (-3dB) |
| Line level | 2.5Vrms (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 response | 20Hz~20kHz (-3dB) |
| Line level | 5Vrms (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 response | 20Hz~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 floor | 5Hz~50kHz (-3dB) |
| Max output level | >51Vp-p |
| General | |
|---|---|
| Supply voltage | 110-115VAC / 220-230VAC |
| Dimensions | |
| Net weight | ~2750g |
| Case material | Aluminum |
| Color | Black |
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
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
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
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
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
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
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
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
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
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
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
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
Distortion diagram of curves 1
Test conditions : Linear input, Vin=480mVrms, high gain, single-ended output (load 32Ω)
Red : left channel / Blue : right channel
Distortion diagram of curves 2
Test conditions : Linear input, Vin=480mVrms, high gain, balanced headphone output (load 32Ω)
Red : left channel / Blue : right channel
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
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
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
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
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
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
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
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
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
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
| Input | Jack 4.4mm |
| Input | USB |
| Input | SPDIF |
| Input | Bluetooth |
| Input | RCA |
| Input | Optical |
| Output | XLR |
| Output | Jack 4.4mm |
| Output | RCA |
| Output | Jack 6.35mm |
| DAC / ADC Chip | ES9038PRO |
| Max sampling rate | DSD256 |
| Max sampling rate | 384kHz |
| Max sampling rate | MQA |
| Color | Black |
| Class | Class D / T |
| Networking | No |
| Remote Control | N/A |
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