FiiO M21

FiiO M21 adopts an all-aluminum alloy body, AG frosted glass back cover, 4.7-inch small screen with built-in oleophobic layer, equipped with a new octa-core Snapdragon 680 chip, 4+64GB storage, Android 13 system, 4 CS43198 matrix DACs, which can provide 950mW (32Ω) thrust, support fully balanced level 2 amplification, and support L0 Dual output, low jitter coaxial output.

Quad DAC Architecture

Equipped with four CS43198 DAC chips for exceptional resolution and pure, detailed sound reproduction.

Powerful Headphone Drive
Balanced output up to 950 mW + 950 mW (32 Ω), easily driving high-impedance over-ear headphones.

Dual Type-C Ports
One USB 3.0 port for data and charging, plus an independent POWER IN port for cleaner, more stable power supply.

High-Resolution Wireless Audio
Supports LDAC, LHDC, aptX HD, and more, with both Bluetooth transmission and reception modes.

Long-Lasting Battery
Up to 14 hours playback on single-ended, 11 hours on balanced, for all-day listening.（The battery life data comes from official sources and is for reference only.）

Crystal-Clear Display
4.7-inch fully laminated screen with 750 × 1334 resolution for sharp, vivid visuals.

Ample Storage Capacity
64 GB built-in storage (≈52 GB available) with microSD expansion up to 2 TB.

Ultra-Low Noise Hi-Fi Performance
SNR up to 126 dB, noise floor under 1.6 μV, and THD+N less than 0.0003% for pristine audio clarity.

Basic Specifications
Colors: Titanium Gold, Dark Blue
Dimensions: ~68 × 121 × 17 mm
Weight: ~193 g

Hardware Configuration
SoC: Qualcomm Snapdragon 680
Operating System: Android 13
DAC: 4 × CS43198
Display: 4.7" fully laminated (750 × 1334)
Battery: 4000 mAh
Charging: Supports PD2.0, PD3.0 PPS fast charging
Battery Life:14 h (single-ended),11 h (balanced)
RAM: 4 GB
Internal Storage: 64 GB (about 52 GB usable)
Storage Expansion: microSD card, up to 2 TB

Connectivity
Headphone Outputs:
Single-ended 3.5 mm PO / LO / SPDIF+
Balanced 4.4 mm PO / LO

USB Interfaces:
Type-C USB 3.0 ×1 (charging/data transfer)
Type-C Power In ×1 (charging/independent power supply)
Bluetooth:Version: 5.0
Transmission: AAC, SBC, aptX, aptX HD, LDAC, LHDC
Reception: SBC, AAC, LDAC

Headphone Output Power
950 mW + 950 mW (32 Ω, THD+N <1%, balanced, over-ear headphone mode)
≥185 mW + 185 mW (300 Ω, THD+N <1%, balanced, over-ear headphone mode)
405 mW + 405 mW (32 Ω, THD+N <1%, single-ended, over-ear headphone mode)
45 mW + 45 mW (300 Ω, THD+N <1%, single-ended, over-ear headphone mode)
720 mW + 720 mW (32 Ω, THD+N <1%, balanced, high gain)
290 mW + 290 mW (32 Ω, THD+N <1%, single-ended, high gain)

Audio Performance
Signal-to-Noise Ratio (SNR): 126 dB (A-weighted)
Noise Floor: <1.6 μV (A-weighted)
Output Impedance: <1 Ω
THD+N: <0.0003% (1 kHz / -4 dB @32 Ω)