Description
The FiiO M21 is built for listeners who want audiophile-grade sound without the premium price tag. It pairs four CS43198 DAC chips with a two-stage OPA1692 amplifier to deliver eight-channel fully balanced output, which means more dynamic range and lower distortion across your music. The 4.7-inch Android 13 display runs the FiiO Music app natively, so you can stream from Tidal, Qobuz, or Spotify directly, or load your own library from the 64GB internal storage plus a microSD slot supporting up to 2TB. Bluetooth 5.0 handles LDAC, LHDC, and aptX HD for wireless listening, while full MQA decoding keeps everything compatible. The patented desktop mode is the real differentiator—when you plug in external power, the device runs entirely off that supply instead of the battery, eliminating noise interference and unlocking a Super High Gain mode that pushes 950mW per channel through the 4.4mm balanced output. The aluminum frame with frosted glass back keeps it at 193g and pocket-friendly, and reviewers consistently praise the clarity and detail retrieval, though some note the plastic construction feels less premium than competitors and the Android interface can lag occasionally.
This is a demonstration unit and may show light signs of handling. Please contact us for current photos and confirmation of its cosmetic condition, included accessories, packaging, and warranty coverage.
Specifications
| DAC | 4× CS43198 |
| Amplifier | OPA1692×2 + SGM8262-2×2 |
| SoC | Qualcomm Snapdragon 680 |
| Display | 4.7-inch (750×1334) bezel-less screen |
| Internal Storage | 64GB (≈52GB available) |
| RAM | 4GB |
| Dimensions | ≈68×121×17mm |
| Weight | ≈193g |
| Output Power (BAL, Super High Gain) | 950mW+950mW (32Ω) |
| SNR | ≥124dB (A-weighted) |
| THD+N | <0.0003% (1kHz/-4dB@32Ω) |
| Frequency Response | 20Hz–85kHz (attenuation <2dB) |
| Bluetooth | 5.0 (LDAC/LHDC/aptX HD/SBC/AAC tx; SBC/AAC/LDAC rx) |
| WiFi | 2.4/5GHz, DLNA, AirPlay, WiFi song transfer |
| MQA | Full decoding support |
| Local Decoding | Up to 384kHz/32bit; DSD256 (Native) |
| USB DAC | Up to 768kHz/32bit; DSD512 (DoP/D2P/Native) |
| Headphone Outputs | 3.5mm (PO) + 4.4mm (BAL) |
| Line Outputs | 3.5mm (shared PO) + 4.4mm (shared BAL) |
| Coaxial Output | 3.5mm (shared PO), up to 384kHz/24bit; DSD128 (DoP) |
| USB Ports | USB-C 3.0 (charging/data) + USB-C POWER IN (external power) |
| Card Expansion | microSD, up to 2TB |
| Battery Life (3.5mm) | ≈15 hours |
| Battery Life (4.4mm BAL) | ≈12.5 hours |
| Charging | PD2.0/PD3.0 fast charging, ~1.5h |
| Operating System | Android 13 |
| Color Options | Titanium Gold / Dark Blue / Black |
