The FiiO M21 Digital Audio Player redefines the entry-level class with its flagship lineage. The compact screen and class-defying performance are massive step forward. The M21 is aiming to be a benchmark for an entirely new generation of digital audio players!
Flagship SoC – A new entry-level benchmark
The Qualcomm Snapdragon 680 has superior performance with less power consumption than the SoCs used by players in the same class. It provides a smooth experience with Android 13.
4 x CS43198 – full of “hearty” power
The four DAC chips allow for an eight-channel fully differential output design, fully unleashing the potential of headphones with class-defying dynamics performance and high anti-interference capabilities. The headphone amplifier section adopts a two-stage circuit design: the first stage is responsible for voltage amplification, while the second stage handles current expansion – all ensuring purer sound with rich detail.
Patented desktop mode – Battery protection expertDesktop mode makes an appearance on an entry-level FiiO player for the first time. When desktop mode is enabled, the M21 is completely powered by an external power supply. The built-in battery is neither charged nor discharged, allowing you to use the player safely on the desktop without degrading its battery.
True quality – Inside and out
The fully aluminium alloy body with an AG frosted glass back offers a delicate textured and comfortable grip. The screen features a delicate texture and comfortable grip. The screen features an oleophobic coating that significantly reduces fingerprints and smudges, making for smoother touch operation.
Flagship-grade power
There are separate power supply paths for the digital and analogue circuits, which effectively reduce crosstalk between the two. The result is more precise digital processing, purer analogue output, and enhanced driving power. The analogue circuit is further subdivided into multiple independent power supplies for components such as the DAC and headphone amplifier. This clean and robust power delivery enhances the dynamic range and leads to greater reproduction of details in the audio – for a more refined and natural sound.
High-end Hifi Parts – For better sound
In the 21’s audio circuit are high-precision thin-film resistors and low-temperature-drift capacitors that ensure refined and stable sound quality, specifically the greater consistency between the left and right channels and across all frequency ranges. Additionally, fine circuits such as the DAC and headphone amplifier are equipped with over 10 low-impedance, high-capacity tantalum capacitors. These provide abundant energy reserves and a robust power supply for more powerful, dynamic sound.
5th-gen FPGA + dual custom femtosecond crystal oscillators
FiiO developed a custom crystal oscillator specifically for the M21, which has been carefully selected to meet femtosecond-level standards in order to ensure consistency and stability in its output. With a high-precision, low-jitter unidentified clock source, it accurately matches PCM and DSD audio at various sampling rates, ensuring precise reproduction of digital audio signals.
15h long battery life – Exploring the world of music
The M21’s 4000mAh high-voltage battery provides up to 15 hours of ultra-long battery life, effortlessly providing the energy for extended listening sessions when commuting or travelling, allowing you to fully immerse yourself in the world of music. It also supports 20W PD fast charging, enabling quick recharges even during short breaks.
Product Specifications
| Feature | Details |
|---|---|
| Processor | Eight-core 6nm Snapdragon 680 |
| Operating System | Android 13 |
| DAC | 4 x CS43198 Matrix DACs |
| Amplification | Fully Balanced 2-Stage Amplification |
| Ports | Dual Type-C ports |
| Coaxial Output | Low-jitter coaxial output |
| Power Modes | Desktop/portable dual power supply modes |
| Display | 4.7-inch compact HD screen |
| Audio Output | 3.5mm + 4.4mm headphone/LO dual output |
| Bluetooth | Bluetooth 5.0 (SBC, AAC, aptX, aptX HD, LDAC, LHDC) |
| Memory | 64GB onboard, expandable via micro SD up to 2TB |
| Dimensions | 68mm x 121mm x 17mm |
| Weight | 193g |
| Signal to Noise Ratio | ≥ 126dB (A-weighted) |
| Noise Floor | < 1.6uV (A-weighted) |
| Output Impedance | < 10Ω |
| THD+N | < 0.0003% (1kHz / -4dB @ 32Ω) |
| Color Options | Dark Blue or Titanium Gold |
FiiO M21 Digital Audio Player
- Pre-installed tempered screen protector
- Protective case in matching colour
- USB data cable
- Quick start guide
Item Ships from our UK Warehouse - Typical delivery is 3 - 5 business days for mainland UK. OTIC can be contacted for updates.
Free shipping on all baskets over £250.
We offer a refund on any unused items, subject to our returns policy.
Click here to view all delivery & returns info - including shipping, tax, and duty information for International Customers.
FiiO M21 – Frequently Asked Questions
Is the FiiO M21 good for driving high-impedance headphones?
Yes, the FiiO M21 features a powerful balanced output with up to 500mW of power, making it suitable for high-impedance headphones such as the Sennheiser HD600/650 and similar audiophile-grade models.
What’s the difference between the FiiO M21 and the M15S?
The M21 offers updated internals, a Snapdragon processor, and a new dual DAC architecture compared to the M15S. It's also more compact and efficient while maintaining flagship sound quality.
Does the FiiO M21 support TIDAL offline playback and streaming?
Yes, the M21 supports full TIDAL integration, including offline playback. It runs Android with full access to the TIDAL app via the FiiO marketplace or APK install.
Is the FiiO M21 compatible with Apple Music Hi-Res Lossless?
Apple Music works on the M21, and Hi-Res Lossless playback is possible through USB DAC output or with specific app versions that support Hi-Res FLAC/ALAC playback.
How does the FiiO M21 compare to Astell&Kern DAPs in the same price range?
The M21 offers incredible value with high-end specs like dual DACs and Android OS. While A&K DAPs focus on luxury design and bespoke software, the M21 delivers similar audio performance at a lower price point.
Can the FiiO M21 be used as a USB DAC for Windows and Mac?
Yes. The M21 functions as a USB DAC for both Windows and macOS. Simply enable USB DAC mode from the settings and connect via USB-C.
What DAC chips are used in the FiiO M21 and how do they affect sound quality?
The M21 uses dual ESS ES9069Q DAC chips which deliver exceptional detail, dynamic range, and ultra-low distortion — ideal for both IEMs and full-size headphones.
How long does the battery last on the FiiO M21 during hi-res playback?
The FiiO M21 offers up to 10 hours of continuous Hi-Res playback, depending on volume and output mode. Battery life may vary with balanced output and streaming services.
Is the FiiO M21 a good upgrade from the FiiO M11 Plus ESS?
Yes, the M21 represents a significant upgrade in processing power, DAC performance, and user interface speed. It’s ideal for audiophiles looking for a next-level DAP in the same ecosystem.
What accessories come with the FiiO M21 in the UK retail box?
The UK retail package includes a USB-C charging/data cable, protective case, screen protector, quick start guide, and warranty documentation.
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