FiiO M21 High-Resolution Digital Audio Player
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FiiO M21 High-Resolution Digital Audio Player
Overview
The FiiO M21 is a portable Android digital audio player with four Cirrus Logic CS43198 DACs, a Qualcomm Snapdragon 680 and a 4.7-inch screen, plus a desktop mode that delivers up to 950mW per channel balanced. It's for listeners who want to play streaming apps or their own library on a dedicated player, with real power for full-size headphones at home and long battery life on the go.
The four CS43198 DACs feed OPA1692 and SGM8262 amp stages through 3.5mm and 4.4mm balanced outputs, both of which double as line outs, and the 3.5mm jack also outputs coaxial digital. In portable mode on high gain, the balanced output gives up to 720mW per channel into 32 ohms. Flip the D.MODE switch and connect external power, and the M21 runs entirely from that supply without charging or draining the battery; in super high gain it moves to a higher-voltage supply for 950mW into 32 ohms and 21Vpp peak voltage, with SNR of 126dB balanced.
It runs Android with 4GB of RAM, 64GB of storage (about 52GB usable) and a microSD slot, and has 2.4GHz/5GHz Wi-Fi with AirPlay and DLNA, plus Pure Music, USB DAC and Bluetooth receiver modes. Bluetooth 5.0 transmits LDAC, LHDC and aptX HD and receives LDAC. It plays up to 384kHz/32-bit and native DSD256 locally, handles 768kHz and DSD512 over USB audio, and fully decodes MQA. The 4000mAh battery runs up to 15 hours single-ended or 12.5 hours balanced and supports 20W PD fast charging. It comes in Titanium Gold, Dark Blue or Black.
Simcoe Audio Video Insight
If the M21 spends time at a desk, use desktop mode: plug a USB power supply into the POWER IN port, flip D.MODE, and it runs from external power while the battery sits idle, which helps protect it. That's also when super high gain unlocks the full 950mW balanced output for demanding headphones. On the go, high gain still gives up to 720mW balanced. The 3.5mm jack can also feed a home DAC as a coaxial digital output.
More Info
Why the FiiO M21 Stands Out
Four CS43198 DACs
With OPA1692 and SGM8262 amps.
950mW Desktop Output
Balanced, super high gain on external power.
Patented Desktop Mode
Runs on external power, battery stays idle.
Android Streaming
Wi-Fi, AirPlay, DLNA and streaming apps.
Two-Way Bluetooth
Sends LDAC/LHDC, receives LDAC.
15-Hour Battery
4000mAh with 20W PD fast charging.
Buyer's Guide
Who It's For
- The Streaming Listener: Wants streaming apps on a dedicated player.
- The Desk and Travel Listener: Uses desktop mode at home.
- The Balanced-Cable Owner: Wants up to 950mW from 4.4mm.
How It Compares
FiiO describes the M21 as its first entry-level player with desktop mode. Compared with the FiiO KA17 dongle, the M21 adds its own battery, screen, storage and Android streaming, and raises balanced desktop-mode output from 650mW to 950mW.
FiiO M21 High-Resolution Digital Audio Player Specifications
| General Information | |
|---|---|
| Model | FiiO M21 |
| Brand | FiiO |
| Product Type | Portable Android digital audio player |
| Colours Available | Titanium Gold, Dark Blue, Black |
| System | |
| SoC | Qualcomm Snapdragon 680 |
| RAM / Storage | 4GB / 64GB (about 52GB usable) |
| Expansion | microSD, up to 2TB |
| Display | 4.7-inch, 750 x 1334 |
| Modes | Android, Pure Music, AirPlay, USB DAC, Bluetooth receiver |
| Audio | |
| DAC | Cirrus Logic CS43198 x4 |
| Amplifier | OPA1692 x2 + SGM8262-2 x2 |
| Local Playback | Up to 384kHz/32-bit, DSD256 (native) |
| USB Audio | Up to 768kHz/32-bit, DSD512 |
| USB DAC | Up to 384kHz/32-bit, DSD256 |
| MQA | Full decoding |
| EQ | 10-band (±12dB), 8 presets |
| Recommended Impedance | 8 to 350Ω |
| 3.5mm Output | |
| Super High Gain | 405mW+405mW @ 32Ω; 480mW+480mW @ 16Ω; 45mW+45mW @ 300Ω |
| High Gain | 290mW+290mW @ 32Ω |
| SNR | ≥124dB (A-weighted) |
| Output Impedance | <1Ω |
| 4.4mm Balanced Output | |
| Super High Gain | 950mW+950mW @ 32Ω; 540mW+540mW @ 16Ω; 185mW+185mW @ 300Ω |
| High Gain | 720mW+720mW @ 32Ω; 90mW+90mW @ 300Ω |
| SNR | ≥126dB (A-weighted) |
| Output Impedance | <1.5Ω |
| Connectivity | |
| Wi-Fi | 2.4GHz/5GHz; AirPlay, DLNA |
| Bluetooth | 5.0; transmit AAC, SBC, aptX, aptX HD, LDAC, LHDC; receive SBC, AAC, LDAC |
| Outputs | 3.5mm (headphone/line/coaxial), 4.4mm (headphone/line) |
| Coaxial Out | Up to 384kHz/24-bit, DSD128 (DoP) |
| USB | USB-C 3.0 (data/charging) + USB-C POWER IN |
| Switches | HOLD, D.MODE |
| Battery and Physical | |
| Battery | 4000mAh; 15h single-ended, 12.5h balanced |
| Charging | PD 2.0/3.0, up to 20W; about 1.5h |
| Dimensions | About 68 x 121 x 17mm |
| Weight | About 193g |
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