| General Specifications |
| Name/Model |
K15 |
Hardware solution |
Main control: X2000; MCU: ESP32-S3; DAC: AK4497S*2; USB decoding: XU316; Bluetooth decoding: QCC5125; AMP: MJE243G/253G discrete transistor current amplification |
| 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 |
| Color |
Black/Silver |
Weight |
About 2100g |
| 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/aptX Adaptive/LDAC |
| Display |
3.93-inch LCD (240*1020) bezel-less screen |
Touch-on-display |
Supported |
| PEQ |
Supports 10-band PEQ (No PEQ processing in line input and balanced input) |
FIIO Link |
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 (PEQ=OFF) |
USB decoding: Up to 768kHz/32bit; DSD512 (Native) |
Screen status indication |
Working mode, output mode |
| Coaxial input decoding: Up to 192kHz/24bit; DSD64 |
Track format, sampling rate |
| Optical input decoding: Up to 96kHz/24bit |
EQ, volume |
| Streaming decoding: Up to 384kHz/32bit; DSD256 (DOP) |
Network status, Bluetooth codec |
| Local playback: Up to 384kHz/32bit; DSD256 |
Gain |
| Adaptive impedance |
PO: 8~150Ω |
|
|
| 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 port*1 |
Headphone out |
Standard 3.5mm port |
| Digital optical input port |
Optical port |
Digital coaxial input port |
RCA port |
| Balanced line output port |
XLR3 balanced port |
Single-ended line output port |
RCA port |
| Balanced line input port |
Standard 4.4mm port |
Single-ended line input port |
RCA port |
| Slide switch |
Power switch |
Housing grounding terminal |
M4 banana port (Can be directly connected to use) |
| Ethernet port |
1000Mbps |
|
|
| Power Supply Parameters |
| Power supply |
AC 100-240V~50/60Hz; DC 12V/≥2.5A (either-or) |
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≥1400mW+1400mW (16Ω, THD+N＜1%) |
Output impedance |
＜1Ω (32Ω) |
| Output power 2 |
L+R≥1400mW+1400mW (32Ω, THD+N＜1%) |
Crosstalk |
≥76dB (1kHz@32Ω) |
| Output power 3 |
L+R≥180mW+180mW (300Ω , THD+N＜1%) |
THD+N |
＜0.00054% (1kHz/-12dB@32Ω) |
| Output power 4 |
＜5.3μV (A-weighted) |
SNR |
≥122dB (A-weighted) |
| Frequency response |
20Hz~20kHz: attenuation＜0.2dB
20Hz~80kHz: attenuation＜2.8dB |
Peak output voltage |
＞20.6Vp-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≥1400mW+1400mW (16Ω, THD+N＜1%) |
Output impedance |
＜1Ω (32Ω) |
| Output power 2 |
L+R≥760mW+760mW (32Ω, THD+N＜1%) |
Crosstalk |
≥76dB (1kHz@32Ω) |
| Output power 3 |
L+R≥90mW+90mW (300Ω , THD+N＜1%) |
THD+N |
＜0.00058% (1kHz/-10dB@32Ω) |
| Output power 4 |
＜5.3μV (A-weighted) |
SNR |
≥119dB (A-weighted) |
| Frequency response |
20Hz~20kHz: attenuation＜0.2dB
20Hz~80kHz: attenuation＜2.8dB |
Peak output voltage |
＞14.6Vp-p |
| Performance and parameters of single-ended line output (RCA out, USB DAC/Coaxial decoding/Optical decoding) |
| THD+N |
＜0.00071% (1kHz/-11dB@10kΩ) |
SNR |
≥119dB (A-weighted) |
| Crosstalk |
≥119dB (1kHz@10kΩ) |
Output power 4 |
＜2.6μV (A-weighted) |
| Frequency response |
20Hz~20kHz: attenuation＜0.2dB
20Hz~80kHz: attenuation＜2.8dB |
Line output level |
2.4Vrms (1kHz@10kΩ) |
| Performance and parameters of balanced headphone output (4.4mm/XLR4 out, USB DAC/Coaxial decoding/Optical decoding, Ultra high gain mode) |
| Output power 1 |
L+R≥1400mW+1400mW (16Ω, THD+N＜1%) |
Output impedance |
＜1.5Ω (32Ω) |
| Output power 2 |
L+R≥3000mW+3000mW (32Ω, THD+N＜1%) |
Crosstalk |
≥116dB (1kHz@32Ω) |
| Output power 3 |
L+R≥700mW+700mW (300Ω , THD+N＜1%) |
THD+N |
＜0.00059% (1kHz/-13dB@32Ω) |
| Output power 4 |
＜9.5μV (A-weighted) |
SNR |
≥120dB (A-weighted) |
| Frequency response |
20Hz~20kHz: attenuation＜0.2dB
20Hz~80kHz: attenuation＜2.8dB |
Peak output voltage |
＞41Vp-p |
| Performance and parameters of balanced headphone output (4.4mm/XLR4 out, USB DAC/Coaxial decoding/Optical decoding, Super high gain mode) |
| Output power 1 |
L+R≥1400mW+1400mW (16Ω, THD+N＜1%) |
Output impedance |
＜1.5Ω (32Ω) |
| Output power 2 |
L+R≥2800mW+2800mW (32Ω, THD+N＜1%) |
Crosstalk |
≥116dB (1kHz@32Ω) |
| Output power 3 |
L+R≥350mW+350mW (300Ω , THD+N＜1%) |
THD+N |
＜0.00054% (1kHz/-9dB@32Ω) |
| Output power 4 |
＜9.5μV (A-weighted) |
SNR |
≥120dB (A-weighted) |
| Frequency response |
20Hz~20kHz: attenuation＜0.2dB
20Hz~80kHz: attenuation＜2.8dB |
Peak output voltage |
＞29Vp-p |
| Performance and parameters of balanced line output (XLR3, USB DAC/Coaxial decoding/Optical decoding) |
| THD+N |
＜0.00055% (1kHz/-8dB@10kΩ) |
SNR |
≥120dB (A-weighted) |
| Crosstalk |
≥117dB (1kHz@10kΩ) |
Output power 4 |
＜3.3μV (A-weighted) |
| Frequency response |
20Hz~20kHz: attenuation＜0.2dB
20Hz~80kHz: attenuation＜2.8dB |
Line output level |
4.8Vrms (1kHz@10kΩ) |
