| General Specifications |
| Name/Model |
M21 |
Hardware solution |
SoC: Qualcomm Snapdragon 680, DAC: CS43198*4, Amp: OPA1692*2+SGM8262-2*2 |
| Working mode |
Android/Pure music/AirPlay/USB DAC/Bluetooth Receiving |
| Color |
Titanium gold/Dark blue |
Weight |
About 193g |
| Dimensions |
About 68x121x17mm |
Volume control type |
Button control |
| Display |
4.7-inch (750x1334) bezel-less screen |
Internal storage/available capacity (ROM) |
64GB/About 52GB |
| RAM |
4GB |
Adaptive impedance |
PO: 8~350Ω |
| Memory card |
Single microSD card expansion, up to 2TB in theory |
BAL: 8~350Ω |
| Channel balance |
L20~R20 (0.5dB per level) |
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| Buttons and Ports |
| Buttons |
Power button*1; Multifunction button*1; Volume button*2; Play/Pause button*1; Previous track*1; Next track*1 |
USB |
Type-C USB3.0*1 (charging/data transmission)+Type-C POWER IN*1 (charging/independent power supply port) |
| Toggle switch |
HOLD switch*1; D.MODE switch*1 |
Headphone out |
Standard 3.5mm |
| Line output |
Standard 3.5mm (shared PO) |
BAL headphone out |
Standard 4.4mm |
| BAL line output |
Standard 4.4mm (shared BAL) |
COAX headphone out |
Standard 3.5mm (shared PO) |
| Exposed contacts |
Connect to cassette-style protective case |
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| 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 (5.0) |
SBC/AAC/LDAC |
FIIO Link |
Android supports WiFi and Bluetooth control, iOS supports Bluetooth control |
| MQA |
Supports MQA full decoding |
ALL TO DSD |
Supported |
| EQ adjustment |
10-band dynamic EQ adjustment (±12dB), built in 8 types of preset EQ, self-define EQ |
System navigation mode |
Supports gesture navigation, 2-button navigation and 3-button navigation |
| Double tap to wake up |
Supported |
Power off timers |
Supports Sleep/Idle power off |
| Max supported sampling rate |
USB DAC: Supports up to 384kHz/32bit; DSD256 (Native) |
Firmware upgrade |
Supports upgrade from local storage/memory card/OTA |
| Local decoding: Supports up to 384kHz/32bit; DSD256 (Native) |
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| USB Audio: 768kHz/32bit; DSD512 (supports DoP/D2P/Native) |
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| Coaxial output: Supports up to 384kHz/24bit; DSD128 (DOP) |
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| Power Supply Parameters |
| Power supply |
Supports D2.0 and PD3.0 fast charging |
Charging time |
About 1.5h (PD3.0 fast charging mode) |
| Battery life and test conditions: |
| 3.5mm headphone out: 15 hours |
| Volume level |
44 |
Gain level |
High gain |
| Display status |
OFF |
Playing track and format |
MP3 44kHz/16bit |
| EQ |
OFF |
Load |
32Ω |
| 4.4mm headphone out: 12.5 hours |
| Volume level |
33 |
Gain level |
High gain |
| Display status |
OFF |
Playing track and format |
MP3 44kHz/16bit |
| EQ |
OFF |
Load |
32Ω |
| Audio Parameters |
| Parts of performance and parameters of PO (3.5mm, USB DAC, Super High Gain mode) |
| Output power |
L+R≥480mW+480mW (16Ω, THD+N＜1%) |
Output impedance |
＜1Ω |
| L+R≥405mW+405mW (32Ω, THD+N＜1%) |
Crosstalk |
≥74dB |
| L+R≥45mW+45mW (300Ω, THD+N＜1%) |
Peak output voltage |
10.6Vp-p |
| SNR |
≥124dB (A-weighted) |
THD+N |
＜0.0003% (1kHz/-4dB@32Ω) |
| Frequency response |
20Hz~85kHz: attenuation＜2dB |
Noise floor |
＜2uV (A-weighted) |
| 20Hz~20KHz: attenuation＜0.02dB |
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| Parts of performance and parameters of PO (3.5mm, USB DAC, High Gain mode) |
| Output power |
L+R≥380mW+380mW (16Ω, THD+N＜1%) |
Output impedance |
＜1Ω |
| L+R≥290mW+290mW (32Ω, THD+N＜1%) |
Crosstalk |
≥74dB |
| L+R≥35mW+35mW (300Ω, THD+N＜1%) |
Peak output voltage |
9.5Vp-p |
| SNR |
≥123dB (A-weighted) |
THD+N |
＜0.0004% (1kHz/-4dB@32Ω) |
| Frequency response |
20Hz~85kHz: attenuation＜2dB |
Noise floor |
＜2.1uV (A-weighted) |
| 20Hz~20KHz: attenuation＜0.02dB |
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| Parts of performance and parameters of LO |
| THD+N |
＜0.0005% (1kHz/-5dB@10KΩ) |
SNR |
≥122dB (A-weighted) |
| Crosstalk |
≥111dB |
Noise floor |
＜1.6uV (A-weighted) |
| Frequency response |
20Hz~85kHz: attenuation＜1.8dB |
Line output level |
1.9Vrms |
| 20Hz~20KHz: attenuation＜0.02dB |
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| Parts of performance and parameters of BAL headphone out (4.4mm, USB DAC, Super High Gain mode) |
| Output power |
L+R≥540mW+540mW (16Ω, THD+N＜1%) |
Output impedance |
＜1.5Ω |
| L+R≥950mW+950mW (32Ω, THD+N＜1%) |
Crosstalk |
≥109dB |
| L+R≥185mW+185mW (300Ω, THD+N＜1%) |
Peak output voltage |
21.2Vp-p |
| SNR |
≥126dB (A-weighted) |
THD+N |
＜0.0005% (1kHz/-12dB@32Ω) |
| Frequency response |
20Hz~85kHz: attenuation＜2dB |
Noise floor |
＜2.7uV (A-weighted) |
| 20Hz~20KHz: attenuation＜0.03dB |
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| Parts of performance and parameters of BAL headphone out (4.4mm, USB DAC, High Gain mode) |
| Output power |
L+R≥600mW+600mW (16Ω, THD+N＜1%) |
Output impedance |
＜1.5Ω |
| L+R≥720mW+720mW (32Ω, THD+N＜1%) |
Crosstalk |
≥109dB |
| L+R≥90mW+90mW (300Ω, THD+N＜1%) |
Peak output voltage |
15Vp-p |
| SNR |
≥125dB (A-weighted) |
THD+N |
＜0.0005% (1kHz/-8dB@32Ω) |
| Frequency response |
20Hz~85kHz: attenuation＜2dB |
Noise floor |
＜2.7uV (A-weighted) |
| 20Hz~20KHz: attenuation＜0.03dB |
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| Parts of performance and parameters of BAL LO |
| THD+N |
＜0.0003% (1kHz/-0dB@10KΩ) |
SNR |
≥126dB (A-weighted) |
| Crosstalk |
≥103dB |
Noise floor |
＜1.9uV (A-weighted) |
| Frequency response |
20Hz~85kHz: attenuation＜1.8dB |
Line output level |
3.9Vrms |
| 20Hz~20KHz: attenuation＜0.02dB |
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