General Specifications
Name/Model K17 Hardware solution SoC: X2000; MCU: ESP32-S3; DAC: AK4191EX+AK4499EQ*2; USB decoding: XU316; Bluetooth decoding: QCC5125; AMP: MJE243G/253G discrete transistor current amplification headphone amplifier
Working mode USB DAC mode/Coaxial decoding mode/Optical decoding mode/Line in mode/Balanced in mode/Bluetooth receiving mode/Streaming media receiving mode/Local playback mode    
Colors Black/Silver Weight About 2750g
Dimensions About 244.6x213x66.8mm Volume control Knob/Touch-on-display/Remote control
MQA Supports MQA full decoding Driver-free mode (Switch mode) Supported
Gain Ultra high gain mode/Super high gain mode/High gain/Medium gain/Low gain Bluetooth receiving (5.1) SBC/AAC/aptX/aptX LL/aptX HD/atpX Adaptive/LDAC
Display 3.93-inch LCD (240*1020) bezel-less screen Touch-on-display Supported
PEQ Supports global 31-band PEQ (No PEQ processing in digital output) FIIO Control Supports settings through the app
WiFi Supports 2.4G/5G dual-band WiFi Firmware upgrade SOC firmware: Upgrade through the rear USB-A port
MCU firmware: Upgrade through the rear RS232 port
XMOS firmware: Upgrade through the front or rear USB-C port
Remote control Supports IR remote control (only the one included in the accessory) Knob indicator light Supports customizing color, brightness, supports always-on indication or RGB pulsing
Max. supported sampling rate USB decoding: Up to 768kHz/32bit; DSD512 (Native) Screen status indication Working mode, output mode
Coaxial input decoding: Up to192kHz/24bit; DSD64 Track format, sampling rate
Optical input decoding: Up to96kHz/24bit EQ, volume
Coaxial output: Up to192kHz/24bit; DSD64 Network status, Bluetooth codec
Optical output: Up to192kHz/24bit Gain, time
Streaming decoding: Up to384kHz/32bit; DSD256 (DOP) Adaptive impedance PO: 8~150Ω
Local playback: Up to384kHz/32bit; DSD256 BAL: 8~350Ω
Buttons and Ports
Knob Power on/off knob*1+Analog output level knob*1+Gain level knob*1+Volume knob with button*1+Menu knob with button*1 USB port Type-C USB*3 (Data transmission port*2+RS232 DSP regulating port*1)
USB-A*1 (Data transmission port)
Balanced headphone out Standard 4.4mm port*1+XLR4 balanced plug*1 Headphone out Standard 3.5mm port
Digital optical input port Optical plug Digital coaxial input port RCA plug
Digital optical output port Optical plug Digital coaxial output port RCA plug
Balanced line output port XLR3 balanced plug Single-ended line output port RCA plug
Balanced line input port Standard 4.4mm port Single-ended line input port RCA plug
Slide switch Ground selector switch Housing grounding terminal M4 banana plug (Can be directly connected to use)
Ethernet port 1000Mbps TRIGGER IN port Standard 3.5mm port
Power Supply Parameters
Power supply AC 100-120V/220-240V~50/60Hz Battery capacity N/A
Audio Parameters
Performance and parameters of headphone output (6.35mm out, USB DAC/Coaxial decoding/Optical decoding, Ultra high gain mode)
Output power 1 L+R≥1800mW+1800mW (16Ω, THD+N<1%) Output impedance <1Ω (32Ω)
Output power 2 L+R≥1850mW+1850mW (32Ω, THD+N<1%) Crosstalk ≥76dB (1kHz@32Ω)
Output power 3 L+R≥240mW+240mW (300Ω, THD+N<1%) THD+N <0.0005% (1kHz/-12dB@32Ω)
Noise floor <5μV (A-weighted) SNR ≥124dB (A-weighted)
Frequency response 20Hz~20kHz: attenuation<0.05dB
20Hz~90kHz: attenuation<3dB
Peak output voltage >24Vp-p
Performance and parameters of headphone output (6.35mm out, USB DAC/Coaxial decoding/Optical decoding, Super high gain mode)
Output power 1 L+R≥1800mW+1800mW (16Ω, THD+N<1%) Output impedance <1Ω (32Ω)
Output power 2 L+R≥1000mW+1000mW (32Ω, THD+N<1%) Crosstalk ≥76dB (1kHz@32Ω)
Output power 3 L+R≥120mW+120mW (300Ω, THD+N<1%) THD+N <0.00056% (1kHz/-9dB@32Ω)
Noise floor <5μV (A-weighted) SNR ≥121dB (A-weighted)
Frequency response 20Hz~20kHz: attenuation<0.05dB
20Hz~90kHz: attenuation<3dB
Peak output voltage >17Vp-p
Performance and parameters of single-ended line output (RCA out, USB DAC/Coaxial decoding/Optical decoding)
THD+N <0.00053% (1kHz/-10dB@10kΩ) SNR ≥121dB (A-weighted)
Crosstalk ≥118dB (1kHz@10kΩ) Noise floor <2.2μV (A-weighted)
Frequency response 20Hz~20kHz: attenuation<0.05dB
20Hz~90kHz: attenuation<3dB
Line output level 2.5Vrms (1kHz@10kΩ)
Performance and parameters of balanced headphone output (4.4mm/XLR4 out, Coaxial decoding/Optical decoding, Ultra high gain mode)
Output power 1 L+R≥1800mW+1800mW (16Ω, THD+N<1%) Output impedance <1.5Ω (32Ω)
Output power 2 L+R≥4000mW+4000mW (32Ω, THD+N<1%) Crosstalk ≥119dB (1kHz@32Ω)
Output power 3 L+R≥950mW+950mW (300Ω, THD+N<1%) THD+N <0.00049% (1kHz/-13dB@32Ω)
Noise floor <7.9μV (A-weighted) SNR ≥124dB (A-weighted)
Frequency response 20Hz~20kHz: attenuation<0.05dB
20Hz~90kHz: attenuation<3dB
Peak output voltage >48Vp-p
Performance and parameters of balanced headphone output (4.4mm/XLR4 out, Coaxial decoding/Optical decoding, Super high gain mode)
Output power 1 L+R≥1800mW+1800mW (16Ω, THD+N<1%) Output impedance <1.5Ω (32Ω)
Output power 2 L+R≥3900mW+3900mW (32Ω, THD+N<1%) Crosstalk ≥119dB (1kHz@32Ω)
Output power 3 L+R≥480mW+480mW (300Ω, THD+N<1%) THD+N <0.00054% (1kHz/-10dB@32Ω)
Noise floor <7.9μV (A-weighted) SNR ≥123dB (A-weighted)
Frequency response 20Hz~20kHz: attenuation<0.05dB
20Hz~90kHz: attenuation<3dB
Peak output voltage >34Vp-p
Performance and parameters of balanced line output (XLR3, USB DAC/Coaxial decoding/Optical decoding)
THD+N <0.00045% (1kHz/-10dB@10kΩ) SNR ≥125dB (A-weighted)
Crosstalk ≥121dB (1kHz@10kΩ) Noise floor <2.6μV (A-weighted)
Frequency response 20Hz~20kHz: attenuation<0.05dB
20Hz~90kHz: attenuation<3dB
Line output level 5Vrms (1kHz@10kΩ)

 

PO Ultra high gain mode@2V 32Ω
PO Super high gain mode@2V 32Ω
BAL PO Ultra high gain mode@4V 32Ω
BAL PO Super high gain mode@4V 32Ω
BAL LO@4V  10KΩ
LO@2V 10KΩ

Frequency response curve 1

 

Test conditions: -5dB sinusoidal signal, Ultra high gain mode, 20Hz-20kHz, 6.35mm headphone out (32Ω load)  

Frequency response curve 2

 

Test conditions: -5dB sinusoidal signal, Ultra high gain mode, 20Hz-90kHz, 6.35mm headphone out (32Ω load)
 

Frequency response curve 3

 

Test conditions: -5dB sinusoidal signal, Super high gain mode, 20Hz-20kHz, 6.35mm headphone out (32Ω load)  
 

Frequency response curve 4

 

Test conditions: -5dB sinusoidal signal, Super high gain mode, 20Hz-90kHz, 6.35mm headphone out (32Ω load)  
 

THD+N curve 1

 

Test conditions: -12dB sinusoidal signal, Ultra high gain mode, 6.35mm headphone out (32Ω load)  
                             

THD+N curve 2

 

 

Test conditions: -9dB sinusoidal signal, Super high gain mode, 6.35mm headphone out (32Ω load)