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FiiO M21 specifications and in-depth review

FiiO M21

Manufacturer: FiiO

The FiiO M21 is a portable MP3 player that offers a combination of high-quality audio features and modern connectivity. With 64GB of internal storage, it provides ample space for your music collection, while its sleek, compact design makes it easy to take on the go.

Under the hood, the FiiO M21 is powered by the Qualcomm Snapdragon 680 chipset and features 4GB of RAM for smooth operation. It supports a variety of audio formats, including MP3, FLAC, WAV, DSD, and more. The device also features multiple audio outputs, including 3.5 mm, 4.4 mm, and USB-C, and offers a 124 dB signal-to-noise ratio for clean sound performance. Connectivity options include Bluetooth 5.0, aptX, LDAC, and Wi-Fi support for versatile audio streaming capabilities.

Pros
  • Supports a wide range of audio formats, including MP3, FLAC, WAV, DSD, and MQA, providing flexibility for various music collections.
  • Equipped with a 64GB internal storage and an external memory slot for expandable storage, offering ample space for your media library.
  • Offers multiple audio output options, including 3.5 mm, 4.4 mm, and USB-C, providing versatility in connecting to different audio devices.
  • Features Bluetooth 5.0 and supports high-quality audio codecs like aptX, LDAC, and aptX HD for improved wireless streaming quality.
  • Compact design with a 4.7-inch touch screen and a weight of 193 g, making it portable and easy to carry.
Cons
  • Does not support wireless charging, limiting convenience for users who prefer cable-free charging.
  • Not weather-sealed, making it less suitable for outdoor or rugged use in wet or dusty environments.
  • Lacks support for the latest Bluetooth features such as aptX Adaptive, aptX Lossless, and aptX Low Latency, which could impact certain high-fidelity audio scenarios.
Who is this for?

The FiiO M21 is ideal for audio enthusiasts who prioritize sound quality and versatility in their portable music player. With support for a wide range of high-resolution audio formats such as MP3, FLAC, WAV, and MQA, it is well-suited for users with diverse music libraries. The device's 64GB of internal storage and expandable memory slot make it perfect for those who need significant storage space on the go. Additionally, its support for advanced Bluetooth codecs like aptX, LDAC, and aptX HD ensures superior wireless audio streaming, making it a solid choice for audiophiles who value high-quality, cable-free listening experiences.

Who is this NOT for?

The FiiO M21 may not be the best option for users who require a rugged, all-weather device, as it lacks weather-sealing, making it vulnerable to environmental elements like rain or dust. It also does not support wireless charging, which could be a drawback for users who prefer the convenience of cable-free charging. Additionally, its limitations in Bluetooth features, such as the absence of aptX Adaptive and aptX Lossless, may not meet the expectations of those seeking the highest fidelity in wireless audio playback.

General info:

internal storage 64GB
Audio outputs 3.5 mm, 4.4 mm, USB-C
DAC name Cirrus Logic CS43198 x4
Audio file types MP3, FLAC, WAV, APE, AIFF, WMA, ALAC, OGG, AAC, DSD, DFF, MQA
Battery life 15 hours
release date May 2025
charge time 1.5 hours
has an external memory slot ✓
Signal-to-noise ratio (SNR) 124 dB
has wireless charging ✕
is weather-sealed (splashproof) ✕
RAM 4GB
Chipset (SoC) name Qualcomm Snapdragon 680
Android version Android 13

The FiiO M21 offers a range of features for high-quality audio and efficient performance. It includes 64GB of internal storage for your music library, and an external memory slot for additional space. The device supports a variety of audio formats, such as MP3, FLAC, WAV, DSD, and MQA, and utilizes the Cirrus Logic CS43198 x4 DAC for enhanced sound quality. You can expect up to 15 hours of battery life, and it charges fully in 1.5 hours. With 4GB of RAM and the Qualcomm Snapdragon 680 chipset, the M21 runs smoothly on Android 13, though it does not feature wireless charging or weather-sealing.

Design:

screen size 4.7"
resolution 750 x 1334 px
pixel density 326 ppi
weight 193 g
Display type LCD
has a touch screen ✓
volume 139.876 cm³
width 68 mm
thickness 17 mm
height 121 mm

The FiiO M21 features a 4.7-inch LCD touch screen with a resolution of 750 x 1334 px, providing a clear and vibrant display. It has a pixel density of 326 ppi, ensuring crisp visuals. With a weight of 193 g and dimensions of 68 mm in width, 17 mm in thickness, and 121 mm in height, it offers a compact yet substantial design that is easy to handle and use.

Connectivity:

Bluetooth version 5
has aptX ✓
has LDAC ✓
has LDHC ✓
has aptX HD ✓
has aptX Adaptive ✕
has aptX Lossless ✕
has AAC ✓
has aptX Low Latency ✕
has AirPlay ✓
supports Wi-Fi ✓

The FiiO M21 offers comprehensive connectivity options, including Bluetooth 5.0 for wireless audio streaming. It supports high-quality codecs such as aptX, LDAC, LDHC, and aptX HD for enhanced sound performance. The device also features AirPlay for seamless streaming and Wi-Fi support for additional connectivity options. However, it does not support aptX Adaptive, aptX Lossless, or aptX Low Latency.

Final Verdict

The FiiO M21 is a solid MP3 player that caters well to audiophiles and users who prioritize high-quality audio playback. With its wide format support and advanced Bluetooth capabilities, including aptX and LDAC, it ensures an exceptional wireless listening experience. Its 64GB of internal storage, combined with an external memory slot, offers ample space for large music libraries. While it may not be ideal for those needing rugged features like weather-sealing or wireless charging, it excels in providing a high-fidelity, portable music solution for those who value sound quality and connectivity.

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