General Specifications
Name/Model M25 Hardware solution SoC: Qualcomm Dragonwing™ QCS6490; DAC: AK4191EQ*1, AK4499EX*2; USB DAC: XU316; Crystal oscillator: FCXO-05*1, custom crystal oscillator*2
Working mode Android mode/Pure Music mode/AirPlay mode/USB DAC mode/Bluetooth Receiving mode
Color Black/Silver Weight About 318g
Dimensions About 139.8x76x18mm Volume control Button control
Display 5.5-inch fully laminated display (1080x2160) Internal storage/user available storage (ROM) 128GB/About 112GB
RAM 8GB Recommended headphone impedance PO: 8~350Ω
Memory card Supports up to 2TB BAL: 8~350Ω
Channel balance L20~R20 (0.5dB per level) Gain selection Super high gain mode (when fast charging is connected)/High/Medium/Low
Buttons and Ports
Buttons Power button*1; Volume button*1; Multifunction button*1; Play/Pause button*1; Previous track button*1; Next track button*1 USB Type-C USB3.0*1 (charging/data transfer) + Type-C POWER IN*1 (charging/dedicated power supply port)
Slide switch D.MODE switch*1; HOLD switch*1 Headphone output Standard 3.5mm port
Line output Standard 3.5mm port (shared with PO) Balanced headphone output Standard 4.4mm port
Balanced line output Standard 4.4mm port (shared with BAL) Coaxial output Standard 3.5mm port (shared with PO)
Special Functions
WiFi 2.4GHz/5GHz, supports AirPlay, WiFi music transfer, etc. Bluetooth transmission (5.2) SBC/aptX/aptX HD/aptX Adaptive/LDAC/LHDC
Bluetooth reception (5.2) SBC/LDAC Remote control Supports WiFi control
MQA Supports full decoding ALL TO DSD Supported
PEQ Supports 31-band PEQ and AUTO EQ Second harmonic regulation Supports 3-level adjustment
Sampling rate support Native decoding: Up to 768kHz/32bit; DSD512 (Native) Double click to wake up Supported
USB DAC: Up to 768kHz/32bit; DSD512 (Native) Screen rotation Supported
USB Audio: 768kHz/32bit; DSD512 (DoP/D2P/Native) Navigation control Supports gesture control, two-button navigation, and three-button navigation.
Coaxial output: Up to 384kHz/24bit; DSD128 (DOP) Power-off timers Supports idle poweroff/sleep
Firmware upgrade Supports local storage upgrade + microSD card local upgrade + OTA push upgrade 　 　
Power Supply Parameters
Power supply Supports QC3.0, QC4.0, PD2.0 and PD3.0 PPS fast charging Charging time About 2.5 hours (PD3.0 PPS fast charging)
Battery Life and Test Conditions: 
3.5mm headphone output: 9.5h
Volume 45 Gain High gain
Display status OFF Playback track and format MP3 44kHz/16bit
EQ OFF Load 32Ω
4.4mm balanced headphone output: 8.5h
Volume 34 Gain High gain
Display status OFF Playback track and format MP3 44kHz/16bit
EQ OFF Load 32Ω
Audio Parameters
Performance and parameters of headphone output (3.5mm output, local playback/USB DAC, super high gain mode)
Output power 1 L+R≥770mW+770mW (16Ω, THD+N＜1%, 3.5Vrms ) Output impedance ＜0.6Ω (32Ω)
Output power 2 L+R≥500mW+500mW (32Ω, THD+N＜1%, 4Vrms ) Crosstalk ≥75dB (1kHz@32Ω)
Output power 3 L+R≥55mW+55mW (300Ω , THD+N＜1%, 4.1Vrms ) Noise floor ＜2.2μV (A-weighted)
THD+N 0.00046% (1kHz/-2dB@32Ω) SNR ≥125dB (A-weighted)
Frequency response 20Hz~20kHz: attenuation＜0.14dB Dynamic range ≥125dB (A-weighted)
20Hz~85kHz: attenuation＜3dB Peak output voltage ＞11.4Vp-p
Performance and parameters of headphone output (3.5mm output, local playback/USB DAC, high gain)
Output power 1 L+R≥495mW+495mW (16Ω, THD+N＜1%, 2.8Vrms ) Output impedance ＜0.6Ω (32Ω)
Output power 2 L+R≥315mW+315mW (32Ω, THD+N＜1%, 3.1Vrms ) Crosstalk ≥75dB (1kHz@32Ω)
Output power 3 L+R≥35mW+35mW (300Ω , THD+N＜1%, 3.3Vrms ) Noise floor ＜1.9μV (A-weighted)
THD+N 0.00046% (1kHz/-3dB@32Ω) SNR ≥124dB (A-weighted)
Frequency response 20Hz~20kHz: attenuation＜0.14dB Dynamic range ≥124dB (A-weighted)
20Hz~85kHz: attenuation＜3dB Peak output voltage ＞9.2Vp-p
Performance and parameters of headphone output (3.5mm output, local playback/USB DAC, medium gain)
Output power 1 L+R≥165mW+165mW (16Ω, THD+N＜1%, 1.6Vrms ) Output impedance ＜0.6Ω (32Ω)
Output power 2 L+R≥85mW+85mW (32Ω, THD+N＜1%, 1.6Vrms ) Crosstalk ≥75dB (1kHz@32Ω)
Output power 3 L+R≥10mW+10mW (300Ω , THD+N＜1%, 1.7Vrms ) Noise floor ＜1.4μV (A-weighted)
THD+N 0.00052% (1kHz/-0dB@32Ω) SNR ≥121dB (A-weighted)
Frequency response 20Hz~20kHz: attenuation＜0.14dB Dynamic range ≥121dB (A-weighted)
20Hz~85kHz: attenuation＜3dB Peak output voltage ＞4.7Vp-p
Performance and parameters of headphone output (3.5mm output, local playback/USB DAC, low gain)
Output power 1 L+R≥40mW+40mW (16Ω, THD+N＜1%, 0.8Vrms ) Output impedance ＜0.6Ω (32Ω)
Output power 2 L+R≥20mW+20mW (32Ω, THD+N＜1%, 0.8Vrms ) Crosstalk ≥75dB (1kHz@32Ω)
Output power 3 L+R≥2mW+2mW (300Ω , THD+N＜1%, 0.8Vrms ) Noise floor ＜1.4μV (A-weighted)
THD+N 0.00084% (1kHz/-0dB@32Ω) SNR ≥115dB (A-weighted)
Frequency response 20Hz~20kHz: attenuation＜0.14dB Dynamic range ≥115dB (A-weighted)
20Hz~85kHz: attenuation＜3dB Peak output voltage ＞2.4Vp-p
Performance and parameters of single-ended line output (3.5mm output, local playback/USB DAC)
THD+N 0.0004% (1kHz/-1dB@32Ω) SNR ≥125dB (A-weighted)
Crosstalk ≥106dB Noise floor ＜1.3uV (A-weighted)
Frequency response 20Hz~20kHz: attenuation＜0.14dB Dynamic range ≥125dB (A-weighted)
20Hz~85kHz: attenuation＜3dB Line output level 2.3Vrms (1kHz@10kΩ)
Performance and parameters of balanced headphone output (4.4mm output, local playback/USB DAC, super high gain mode)
Output power 1 L+R≥1000mW+1000mW (16Ω, THD+N＜1%, 4Vrms ) Output impedance ＜0.9Ω (32Ω)
Output power 2 L+R≥1700mW+1700mW (32Ω, THD+N＜1%, 7.4Vrms ) Crosstalk ≥110dB (1kHz@32Ω)
Output power 3 L+R≥220mW+220mW (300Ω , THD+N＜1%, 8.1Vrms ) Noise floor ＜2.9μV (A-weighted)
THD+N 0.00053% (1kHz/-3dB@32Ω) SNR ≥128dB (A-weighted)
Frequency response 20Hz~20kHz: attenuation＜0.14dB Dynamic range ≥129dB (A-weighted)
20Hz~85kHz: attenuation＜3dB Peak output voltage ＞23Vp-p
Performance and parameters of balanced headphone output (4.4mm output, local playback/USB DAC, high gain)
Output power 1 L+R≥970mW+970mW (16Ω, THD+N＜1%, 3.9Vrms ) Output impedance ＜0.9Ω (32Ω)
Output power 2 L+R≥1000mW+1000mW (32Ω, THD+N＜1%, 5.7Vrms ) Crosstalk ≥110dB (1kHz@32Ω)
Output power 3 L+R≥140mW+140mW (300Ω , THD+N＜1%, 6.5Vrms ) Noise floor ＜2.9μV (A-weighted)
THD+N 0.00049% (1kHz/-3dB@32Ω) SNR ≥126dB (A-weighted)
Frequency response 20Hz~20kHz: attenuation＜0.14dB Dynamic range ≥126dB (A-weighted)
20Hz~85kHz: attenuation＜3dB Peak output voltage ＞18.5Vp-p
Performance and parameters of balanced headphone output (4.4mm output, local playback/USB DAC, medium gain)
Output power 1 L+R≥645mW+645mW (16Ω, THD+N＜1%, 3.2Vrms ) Output impedance ＜0.9Ω (32Ω)
Output power 2 L+R≥340mW+340mW (32Ω, THD+N＜1%, 3.3Vrms ) Crosstalk ≥110dB (1kHz@32Ω)
Output power 3 L+R≥40mW+40mW (300Ω , THD+N＜1%, 3.4Vrms ) Noise floor ＜2.1μV (A-weighted)
THD+N 0.00048% (1kHz/-3dB@32Ω) SNR ≥124dB (A-weighted)
Frequency response 20Hz~20kHz: attenuation＜0.14dB Dynamic range ≥124dB (A-weighted)
20Hz~85kHz: attenuation＜3dB Peak output voltage ＞9.5Vp-p
Performance and parameters of balanced headphone output (4.4mm output, local playback/USB DAC, low gain)
Output power 1 L+R≥160mW+160mW (16Ω, THD+N＜1%, 1.6Vrms ) Output impedance ＜0.9Ω (32Ω)
Output power 2 L+R≥85mW+85mW (32Ω, THD+N＜1%, 1.6Vrms ) Crosstalk ≥109dB (1kHz@32Ω)
Output power 3 L+R≥10mW+10mW (300Ω , THD+N＜1%, 1.7Vrms ) Noise floor ＜2.1μV (A-weighted)
THD+N 0.0005% (1kHz/-3dB@32Ω) SNR ≥118dB (A-weighted)
Frequency response 20Hz~20kHz: attenuation＜0.14dB Dynamic range ≥118dB (A-weighted)
20Hz~85kHz: attenuation＜3dB Peak output voltage ＞4.5Vp-p
Performance and parameters of balanced line output (4.4mm output, local playback/USB DAC)
THD+N 0.00038% (1kHz/-5dB@10KΩ) SNR ≥128dB (A-weighted)
Crosstalk ≥107dB Noise floor ＜1.9uV (A-weighted)
Frequency response 20Hz~20kHz: attenuation＜0.14dB Dynamic range ≥128dB (A-weighted)
20Hz~85kHz: attenuation＜3dB Line output level 4.6Vrms (1kHz@10kΩ)
Audio format supported
Lossless:  DSD: DSD64/128/256/512 (".iso", ".dsf", ".dff"), DST iSO
DXD: 352.8kHz/24bit
APE FAST/High/Normal: 384kHz/24bit (MAX)
APE Extra High: 192kHz/24bit (MAX)
APE Insane: 96kHz/24bit (MAX)
Apple Lossless: 384kHz/32bit (MAX)
AIFF: 768kHz/32bit (MAX)
FLAC: 768kHz/32bit (MAX)
WAV: 768kHz/32bit (MAX)
WMA LOSSLESS: 96kHz/24bit (MAX)
Lossy compression:  MP3, OGG, WMA, etc.
General Specifications
Name/Model M25 R2R Hardware solution SoC: Qualcomm Dragonwing™ QCS6490; DAC: FIIO R2R PRO; USB DAC: XU316
Working mode Android mode/Pure Music mode/AirPlay mode/USB DAC mode/Bluetooth Receiving mode
Color Black/Silver Weight About 318g
Dimensions About 139.8x76x18mm Volume control Button control
Display 5.5-inch fully laminated display (1080x2160)  Internal storage/user available storage (ROM)  128GB/About 112GB
RAM 8GB Recommended headphone impedance PO: 8~350Ω
Memory card Supports up to 2TB BAL: 8~350Ω
Channel balance L20~R20 (0.5dB per level)  Gain selection Super high gain mode (when fast charging is connected)/High/Medium/Low
Buttons and Ports
Buttons Power button*1; Volume button*1; Multifunction button*1; Play/Pause button*1; Previous track button*1; Next track button*1 USB Type-C USB3.0*1 (charging/data transfer) + Type-C POWER IN*1 (charging/dedicated power supply port) 
Slide switch D.MODE switch*1; HOLD switch*1 Headphone output Standard 3.5mm port
Line output Standard 3.5mm port (shared with PO)  Balanced headphone output Standard 4.4mm port
Balanced line output Standard 4.4mm port (shared with BAL)  Coaxial output Standard 3.5mm port (shared with PO) 
Special Functions
WiFi 2.4GHz/5GHz, supports AirPlay, WiFi music transfer, etc. Bluetooth transmission (5.2)  SBC/aptX/aptX HD/aptX Adaptive/LDAC/LHDC
Bluetooth reception (5.2)  SBC/LDAC Remote control Supports WiFi control
MQA Supports full decoding ALL TO DSD Supported
PEQ Supports 31-band PEQ and AUTO EQ Double click to wake up Supported
Sampling rate support Native decoding: Up to 768kHz/32bit; DSD512 (Native)  Screen rotation Supported
USB DAC: Up to 768kHz/32bit; DSD512 (Native)  Navigation control Supports gesture control, two-button navigation, and three-button navigation.
USB Audio: 768kHz/32bit; DSD512 (DoP/D2P/Native)  Power-off timers Supports idle poweroff/sleep
Coaxial output: Up to 384kHz/24bit; DSD128 (DOP)  Firmware upgrade Supports local storage upgrade + microSD card local upgrade + OTA push upgrade
Personalized sound Flat/Warm 　 　
Power Supply Parameters
Power supply Supports QC3.0, QC4.0, PD2.0 and PD3.0 PPS fast charging Charging time About 2.5 hours (PD3.0 PPS fast charging) 
Battery Life and Test Conditions: 
3.5mm headphone output: 14.5h
Volume 43 Gain High gain
Display status OFF Playback track and format MP3 44kHz/16bit
EQ OFF Load 32Ω
Personalized sound Flat PCM output mode NOS
4.4mm balanced headphone output: 12.5h
Volume 31 Gain High gain
Display status OFF Playback track and format MP3 44kHz/16bit
EQ OFF Load 32Ω
Personalized sound Flat PCM output mode NOS
Audio Parameters
Performance and parameters of headphone output (3.5mm output, local playback/USB DAC, flat, super high gain mode) 
Output power 1 L+R≥770mW+770mW (16Ω, THD+N＜1%, 3.5Vrms )  Output impedance ＜0.6Ω (32Ω) 
Output power 2 L+R≥500mW+500mW (32Ω, THD+N＜1%, 4Vrms )  Crosstalk ≥75dB (1kHz@32Ω) 
Output power 3 L+R≥55mW+55mW (300Ω , THD+N＜1%, 4.1Vrms )  Noise floor ＜3.3μV (A-weighted) 
THD+N PCM: 0.005% (1kHz/-3dB@32Ω)  SNR ≥122dB (A-weighted) 
DSD: 0.0019% (1kHz/-12dB@32Ω)  Dynamic range ≥121dB (A-weighted) 
Frequency response 20Hz~20kHz: attenuation＜1.2dB Peak output voltage ＞11.4Vp-p
20Hz~45kHz: attenuation＜3dB 　 　
Performance and parameters of headphone output (3.5mm output, local playback/USB DAC, flat, high gain) 
Output power 1 L+R≥495mW+495mW (16Ω, THD+N＜1%, 2.8Vrms )  Output impedance ＜0.6Ω (32Ω) 
Output power 2 L+R≥315mW+315mW (32Ω, THD+N＜1%, 3.1Vrms )  Crosstalk ≥75dB (1kHz@32Ω) 
Output power 3 L+R≥35mW+35mW (300Ω , THD+N＜1%, 3.3Vrms )  Noise floor ＜2.7μV (A-weighted) 
THD+N PCM: 0.005% (1kHz/-4dB@32Ω)  SNR ≥121dB (A-weighted) 
DSD: 0.0018% (1kHz/-7.5dB@32Ω)  Dynamic range ≥120dB (A-weighted) 
Frequency response 20Hz~20kHz: attenuation＜1.2dB Peak output voltage ＞9.2Vp-p
20Hz~45kHz: attenuation＜3dB 　 　
Performance and parameters of headphone output (3.5mm output, local playback/USB DAC, flat, medium gain) 
Output power 1 L+R≥165mW+165mW (16Ω, THD+N＜1%, 1.6Vrms )  Output impedance ＜0.6Ω (32Ω) 
Output power 2 L+R≥85mW+85mW (32Ω, THD+N＜1%, 1.6Vrms )  Crosstalk ≥75dB (1kHz@32Ω) 
Output power 3 L+R≥10mW+10mW (300Ω , THD+N＜1%, 1.7Vrms )  Noise floor ＜2.7μV (A-weighted) 
THD+N PCM: 0.005% (1kHz/-5dB@32Ω)  SNR ≥116dB (A-weighted) 
DSD: 0.0018% (1kHz/0dB@32Ω)  Dynamic range ≥116dB (A-weighted) 
Frequency response 20Hz~20kHz: attenuation＜1.2dB Peak output voltage ＞4.7Vp-p
20Hz~45kHz: attenuation＜3dB 　 　
Performance and parameters of headphone output (3.5mm output, local playback/USB DAC, flat, low gain) 
Output power 1 L+R≥40mW+40mW (16Ω, THD+N＜1%, 0.8Vrms )  Output impedance ＜0.6Ω (32Ω) 
Output power 2 L+R≥20mW+20mW (32Ω, THD+N＜1%, 0.8Vrms )  Crosstalk ≥75dB (1kHz@32Ω) 
Output power 3 L+R≥2mW+2mW (300Ω , THD+N＜1%, 0.8Vrms )  Noise floor ＜2.7μV (A-weighted) 
THD+N PCM: 0.006% (1kHz/0dB@32Ω)  SNR ≥108dB (A-weighted) 
DSD: 0.0018% (1kHz/0dB@32Ω)  Dynamic range ≥108dB (A-weighted) 
Frequency response 20Hz~20kHz: attenuation＜1.2dB Peak output voltage ＞2.4Vp-p
20Hz~45kHz: attenuation＜3dB 　 　
Performance and parameters of single-ended line output (3.5mm output, local playback/USB DAC, flat)
THD+N PCM: 0.0053% (1kHz/-3dB@32Ω)  SNR ≥120dB (A-weighted) 
DSD: 0.0016% (1kHz/0dB@32Ω)  Noise floor ＜2.1uV (A-weighted) 
Crosstalk ≥104dB Dynamic range ≥120dB
Frequency response 20Hz~20kHz: attenuation＜0.5dB Line output level 2.1Vrms (1kHz@10kΩ) 
20Hz~80kHz: attenuation＜3dB 　 　
Performance and parameters of balanced headphone output (4.4mm output, local playback/USB DAC, flat, super high gain mode)
Output power 1 L+R≥1000mW+1000mW (16Ω, THD+N＜1%, 4Vrms )  Output impedance ＜0.8Ω (32Ω) 
Output power 2 L+R≥1700mW+1700mW (32Ω, THD+N＜1%, 7.4Vrms )  Crosstalk ≥114dB (1kHz@32Ω) 
Output power 3 L+R≥220mW+220mW (300Ω , THD+N＜1%, 8.1Vrms )  Noise floor ＜6.6μV (A-weighted) 
THD+N PCM: 0.0053% (1kHz/-5dB@32Ω)  SNR ≥121dB (A-weighted) 
DSD: 0.0022% (1kHz/-10dB@32Ω)  Dynamic range ≥121dB (A-weighted) 
Frequency response 20Hz~20kHz: attenuation＜1.2dB Peak output voltage ＞23Vp-p
20Hz~45kHz: attenuation＜3dB 　 　
Performance and parameters of balanced headphone output (4.4mm output, local playback/USB DAC, flat, high gain)
Output power 1 L+R≥970mW+970mW (16Ω, THD+N＜1%, 3.9Vrms )  Output impedance ＜0.8Ω (32Ω) 
Output power 2 L+R≥1000mW+1000mW (32Ω, THD+N＜1%, 5.7Vrms )  Crosstalk ≥113dB (1kHz@32Ω) 
Output power 3 L+R≥140mW+140mW (300Ω , THD+N＜1%, 6.5Vrms )  Noise floor ＜5.8μV (A-weighted) 
THD+N PCM: 0.005% (1kHz/-5dB@32Ω)  SNR ≥120dB (A-weighted) 
DSD: 0.0021% (1kHz/-10dB@32Ω)  Dynamic range ≥120dB (A-weighted) 
Frequency response 20Hz~20kHz: attenuation＜1.2dB Peak output voltage ＞18.5Vp-p
20Hz~45kHz: attenuation＜3dB 　 　
Performance and parameters of balanced headphone output (4.4mm output, local playback/USB DAC, flat, medium gain)
Output power 1 L+R≥645mW+645mW (16Ω, THD+N＜1%, 3.2Vrms )  Output impedance ＜0.8Ω (32Ω) 
Output power 2 L+R≥340mW+340mW (32Ω, THD+N＜1%, 3.3Vrms )  Crosstalk ≥112dB (1kHz@32Ω) 
Output power 3 L+R≥40mW+40mW (300Ω , THD+N＜1%, 3.4Vrms )  Noise floor ＜5.1μV (A-weighted) 
THD+N PCM: 0.005% (1kHz/-5dB@32Ω)  SNR ≥117dB (A-weighted) 
DSD: 0.0015% (1kHz/-3dB@32Ω)  Dynamic range ≥116dB (A-weighted) 
Frequency response 20Hz~20kHz: attenuation＜1.2dB Peak output voltage ＞9.5Vp-p
20Hz~45kHz: attenuation＜3dB 　 　
Performance and parameters of balanced headphone output (4.4mm output, local playback/USB DAC, flat, low gain)
Output power 1 L+R≥160mW+160mW (16Ω, THD+N＜1%, 1.6Vrms )  Output impedance ＜0.8Ω (32Ω) 
Output power 2 L+R≥85mW+85mW (32Ω, THD+N＜1%, 1.6Vrms )  Crosstalk ≥106dB (1kHz@32Ω) 
Output power 3 L+R≥10mW+10mW (300Ω , THD+N＜1%, 1.7Vrms )  Noise floor ＜4.7μV (A-weighted) 
THD+N PCM: 0.0049% (1kHz/-3dB@32Ω)  SNR ≥110dB (A-weighted) 
DSD: 0.0016% (1kHz/0dB@32Ω)  Dynamic range ≥110dB (A-weighted) 
Frequency response 20Hz~20kHz: attenuation＜1.2dB Peak output voltage ＞4.5Vp-p
20Hz~45kHz: attenuation＜3dB 　 　
Performance and parameters of balanced line output (4.4mm output, local playback/USB DAC, flat) 
THD+N PCM: 0.0049% (1kHz/-6dB@32Ω)  SNR ≥123dB (A-weighted) 
DSD: 0.0015% (1kHz/0dB@32Ω)  Noise floor ＜2.9uV (A-weighted) 
Crosstalk ≥105dB Dynamic range ≥121dB (A-weighted) 
Frequency response 20Hz~20kHz: attenuation＜0.5dB Line output level 4.2Vrms (1kHz@10kΩ) 
20Hz~80kHz: attenuation＜3dB 　 　
Audio format supported
Lossless:  DSD: DSD64/128/256/512 (".iso", ".dsf", ".dff") , DST iSO
DXD: 352.8kHz/24bit
APE FAST/High/Normal: 384kHz/24bit (MAX)
APE Extra High: 192kHz/24bit (MAX)
APE Insane: 96kHz/24bit (MAX)
Apple Lossless: 384kHz/32bit (MAX)
AIFF: 768kHz/32bit (MAX)
FLAC: 768kHz/32bit (MAX)
WAV: 768kHz/32bit (MAX)
WMA LOSSLESS: 96kHz/24bit (MAX) 
Lossy compression:  MP3, OGG, WMA, etc.