General Specifications
Name/Model S15 Hardware solution Master control: Qualcomm Snapdragon 660, DAC: AK4191+AK4499EX, USB decoding: XU316, Bluetooth: QCC5125 (reception)
Work mode Android mode/Pure Music mode/USB DAC mode/Bluetooth receiving mode/AirPlay mode/Coaxial Decoding mode/Roon Ready/Optical Decoding mode/HDMI IN mode, HDMI ARC mode and AES Decoding mode
Color Black/Silver Weight About 5647g
Dimensions About 430x274.5x89.5mm Volume control Volume knob
Display 7.84-inch (400*1280) bezel-less display ROM 64GB/About 46GB available
RAM 4GB M.2 portable hard disk Supports 2TB 
Storage card Single microSD card expansion, supports up to 2TB in theory Channel balance L20~R20 (each for 0.5dB)
Buttons and Ports
Knob Encoder knob (including volume adjusting)*1+Output selection knob (including power on/off)*1 USB Type-C USB3.0*1+USB A*2 (data transfer)
Grounding terminal M6x23mm grounding terminal Toggle switch Ground selection switch*1
Balanced line-out port XLR3 balanced port Single-ended line-out port RCA port*2
Digital optical input port Optical port Digital coaxial input port RCA port
Digital optical output port Optical port Digital coaxial output port RCA port
AES input port XLR3 balanced port AES output port XLR3 balanced port
TRIGGER port Standard 3.5mm headphone port (TRIGGER OUT port*1) HDMI port HDMI IN port*1, HDMI OUT (ARC) port*1
Ethernet port 100M Ethernet port I2S port HDMI I2S output port*1
Special Functions
WiFi 2.4GHz/5GHz, supports DLNA, AirPlay, WiFi song transfer, Roon Ready, etc. Bluetooth transmission (5.0) AAC/SBC/aptX/aptX HD/LDAC/LHDC
Bluetooth reception (5.1) SBC/AAC/aptX/aptX LL/aptX HD/aptX Adaptive/LDAC FIIO Link Android supports WiFi and Bluetooth control, iOS supports Bluetooth control
HDMI decoding Supports audio decoding for DVD/set-top box/computer  HDMI ARC Supports audio decoding for devices with ARC function
HDMI I2S Supports audio decoding for devices with I2S input All to DSD Supported
EQ adjustment 10-band dynamic EQ adjustment (±12dB), built-in 8 preset EQ, supports self-define EQ MQA Supports full decoding
Operating mode Supports gesture navigation, two-button navigation and three-button navigation Bluetooth codec indicator (knob indicator light) Blue: SBC
Max. supported sampling rate USB DAC: Up to768kHz/32bit; DSD512 (Native) Cyan: AAC
Native decoding: Up to384kHz/32bit; DSD256 (Native) Purple: aptX/aptX LL
USB Audio: 768kHz/32bit; DSD512 (supports DoP/D2P/Native) Yellow: aptX HD
Coaxial in decoding: Up to192kHz/24bit White: LDAC
AES in decoding: Up to192kHz/24bit Green: aptX Adaptive
Optical in decoding: Up to96kHz/24bit Orange: LHDC
Coaxial out: Up to384kHz/24bit; DSD128 (D2P/DOP) Sampling rate indicator (knob indicator light) Blue: Lossy
AES out: Up to384kHz/24bit; DSD128 (D2P/DOP) Cyan: SQ
Optical out: Up to192kHz/24bit Yellow: HR
HDMI in: Up to192kHz/24bit Green: DSD
HDMI out: Up to192kHz/24bit Magenta: MQA
Screensaver Supported Double tap to wake up Supported
Firmware upgrade Supports upgrade through local storage+microSD card+OTA  
Power Supply Parameters
Power supply Supports AC 110~120V/220~240V 50/60Hz; 230V and 115V input level switch  
Audio Parameters
Performance and parameters of pre XLR out (XLR3 out, USB DAC/Optical/Coaxial/AES decoding)
THD+N <0.00023% (1kHz/0dB@10KΩ) SNR ≥131dB (A-weighted)
Crosstalk ≥126dB Noise floor <2.6uV (A-weighted)
Frequency response 20Hz~70kHz: attenuation<2.8dB Line output level 8.9Vrms
20Hz~20KHz: attenuation<0.3dB    
Performance and parameters of pre RCA out (RCA out, USB DAC/Optical/Coaxial/AES decoding)
THD+N <0.00026% (1kHz/-0dB@10KΩ) SNR ≥128dB (A-weighted)
Crosstalk ≥120dB Noise floor <1.8uV (A-weighted)
Frequency response 20Hz~70kHz: attenuation<2.8dB Line output level 4.5Vrms
20Hz~20KHz: attenuation<0.3dB    
Performance and parameters of XLR out (XLR3 out, USB DAC/Optical/Coaxial/AES decoding)
THD+N <0.00026% (1kHz/-0dB@10KΩ) SNR ≥126dB (A-weighted)
Crosstalk ≥120dB Noise floor <2.5uV (A-weighted)
Frequency response 20Hz~70kHz: attenuation<2.8dB Line output level 4.8Vrms
20Hz~20KHz: attenuation<0.3dB    
Performance and parameters of RCA out (RCA out, USB DAC/Optical/Coaxial/AES decoding)
THD+N <0.00027% (1kHz/-0dB@10KΩ) SNR ≥122dB (A-weighted)
Crosstalk ≥117dB Noise floor <1.8uV (A-weighted)
Frequency response 20Hz~70kHz: attenuation<2.8dB Line output level 2.4Vrms
20Hz~20KHz: attenuation<0.3dB    

 

  PreRCA@10KΩ  
 RCA @10KΩ  
PreBALLO@10KΩ  
 BAL LO @10KΩ
 
Test conditions: -5dB sinusoidal signal, 20Hz-20kHz, pre line-out (10KΩ load)