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FIIO M21
Advanced portable Hi-Res player.
DACs: 4 × CS43198 with 8-channel balanced output
Snapdragon 680 processor + Android 13
4.7" laminated display
Battery: 4000 mAh, up to 15 hours of use, PD fast charging
Connectivity: Bluetooth 5.0 (LDAC, aptX HD, etc.), Wi-Fi, USB-C 3.0
Storage: 64 GB + microSD up to 2 TB
Outputs: 3.5 mm, 4.4 mm balanced, SPDIF, USB DAC
Power (4.4 mm BAL): Up to 950 mW + 950 mW @ 32 Ω
Desktop mode: No battery usage, ideal for fixed setups
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FiiO M21. High-Resolution Portable Audio Player with Quad DAC and Snapdragon 680
The FiiO M21 is a high-performance portable digital audio player (DAP) crafted for demanding audiophiles seeking premium sound quality, powerful output, and versatile functionality in a compact form. Powered by a Snapdragon 680 processor and running Android 13, the M21 ensures smooth operation and full compatibility with popular streaming apps.
Equipped with four Cirrus Logic CS43198 DACs, the M21 offers true balanced 8-channel output with exceptional resolution and sound fidelity. Its new Desktop Mode allows for continuous operation via USB power without consuming the battery—perfect for use in stationary Hi-Fi setups.
With multiple outputs (3.5 mm, 4.4 mm, SPDIF, USB-C), the M21 functions as a standalone player, DAC, digital transport, or balanced line-out source. It features a precision-machined aluminum and frosted glass body, with internal shielding to isolate analog and digital circuits for pure, interference-free audio.
Key Features
Quad DAC architecture: 4× CS43198 DAC chips for 8-channel balanced output
Android 13 OS with Snapdragon 680 for fast and stable performance
Fully balanced outputs: 3.5 mm (PO/LO/SPDIF) + 4.4 mm (PO/LO)
Desktop Mode: USB-powered playback bypasses internal battery wear
High-resolution playback: PCM up to 768 kHz / 32-bit, DSD512 native
Bluetooth 5.0 with aptX HD, LDAC, LHDC for wireless Hi-Res streaming
Fast charging (20W PD) and long battery life (up to 15 hours)
Technical Specifications
Hardware and Dimensions
Size: 68 × 121 × 17 mm
Weight: approx. 193 g
Processor: Qualcomm Snapdragon 680 (Octa-core)
RAM: 4 GB
Storage: 64 GB internal + microSD up to 2 TB
Display: 4.7” laminated touchscreen
Battery: 4000 mAh, up to 15 h playback (3.5 mm), 12.5 h (4.4 mm)
Charging: USB-C PD fast charge (1.5 h full)
Audio & Output Performance
DAC and Playback Support
DAC: 4× CS43198
Local decoding: up to 384 kHz / 32-bit, DSD256
USB DAC: up to 384 kHz / 32-bit, DSD256
USB Audio Out: up to 768 kHz / 32-bit, DSD512 (DoP/natively)
Coaxial output: up to 384 kHz / 24-bit, DSD128 (DoP)
Bluetooth Codecs
Transmission: SBC, AAC, aptX, aptX HD, LDAC, LHDC
Reception: SBC, AAC, LDAC
Audio Outputs
3.5 mm: PO/LO/SPDIF
4.4 mm balanced: PO/LO
USB-C 3.0: data and charging
Desktop mode: direct USB power
Output Power (Super High Gain)
3.5 mm PO Output
16 Ω: ≥480 mW + 480 mW
32 Ω: ≥405 mW + 405 mW
300 Ω: ≥45 mW + 45 mW
SNR: ≥124 dB, THD+N < 0.0003%, Noise: <2 uV
4.4 mm Balanced PO Output
16 Ω: ≥540 mW + 540 mW
32 Ω: ≥950 mW + 950 mW
300 Ω: ≥185 mW + 185 mW
Peak voltage: 21.2 Vp-p
SNR: ≥126 dB, THD+N < 0.0005%, Noise: <2.7 uV
Line-Out (LO)
Output level: 1.9 Vrms
SNR: ≥122 dB, THD+N < 0.0005%, Noise: <1.6 uV
The FiiO M21 is a true powerhouse in the world of portable Hi-Res audio, blending desktop-grade sound with the flexibility of Android and multi-device connectivity—making it an ideal player for both on-the-go listening and high-end desktop setups.
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