FiiO JM21 High-Resolution Digital Audio Player
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FiiO JM21 High-Resolution Digital Audio Player
Overview
The FiiO JM21 is a slim portable music player that runs a customized Android 13, with two Cirrus Logic CS43198 DACs and both 3.5mm and 4.4mm balanced headphone outputs. It's for listeners who want a dedicated player for their lossless library and streaming apps, with more power and cleaner sound than a phone, in a body just 13mm thick.
Two CS43198 DACs pair with two SGM8262 op-amps in a fully balanced design, fed by a three-stage segmented power supply with separate digital and analog sections and shielded partitions. FiiO's 5th-gen FPGA and two custom femtosecond crystal oscillators clean up timing for local files, streaming apps and external DACs alike. The 4.4mm output delivers up to 700mW per channel into 32 ohms with an SNR of at least 129dB, and the 3.5mm output gives 245mW per channel with at least 124dB. Three gain levels each have their own volume curve.
A Qualcomm Snapdragon 680 runs the 4.7-inch HD touchscreen and Android 13, with Wi-Fi, DLNA, AirPlay and two-way Bluetooth 5.0 (sending LDAC, aptX HD, aptX, LHDC, AAC and SBC; receiving LDAC, AAC and SBC). It plays up to 384kHz/32-bit and native DSD256, outputs up to 768kHz/32-bit and DSD512 to an external USB DAC, and works as a USB DAC itself. It comes as 3GB+32GB (about 12.5 hours) or 4GB+64GB (about 16 hours), both with microSD support up to 2TB, and weighs about 156g.
Simcoe Audio Video Insight
The JM21 is a good fit if you want a phone-sized player for streaming and local files without tying up your phone. FiiO notes that the 3GB model works best with just your streaming music apps installed, so if you plan to run several apps, the 4GB+64GB version is the better pick. Use the 4.4mm output when you need the most power, and choose low gain for sensitive IEMs.
More Info
Why the FiiO JM21 Stands Out
Dual CS43198 DACs
Fully balanced design with two SGM8262 op-amps.
Up to 700mW Balanced
4.4mm output with an SNR of 129dB or better.
Android 13
Install streaming apps on a 4.7-inch HD touchscreen.
Two-Way Bluetooth
Send LDAC and aptX HD, or receive LDAC from your phone.
Clean Power and Clocking
Segmented power supply, FPGA and femtosecond oscillators.
Slim and Light
About 13mm thick and 156g.
Buyer's Guide
Who It's For
- The Streaming Listener: Wants Apple Music and other streaming apps on a dedicated player.
- The Balanced IEM Owner: Wants 4.4mm power in a pocketable size.
- The Wireless Listener: Wants LDAC to headphones or from a phone.
How It Compares
The JM21 offers two storage versions: 3GB+32GB with about 12.5 hours of battery from the 3.5mm output, and 4GB+64GB with about 16 hours. Both share the same DACs, outputs and Android 13 system.
FiiO JM21 High-Resolution Digital Audio Player Specifications
| General Information | |
|---|---|
| Model | FiiO JM21 |
| Brand | FiiO |
| Product Type | Portable digital audio player, Android 13 |
| Processor | Qualcomm Snapdragon 680 |
| Modes | Android, Pure Music, USB DAC, Bluetooth receiver |
| Audio | |
| DAC | 2x Cirrus Logic CS43198 |
| Amplifier | 2x SGM8262, fully balanced |
| Gain | Low, medium, high |
| Local Playback | Up to 384kHz/32-bit, DSD256 (native) |
| USB DAC Mode | Up to 384kHz/32-bit, DSD256 (native) |
| USB Audio Out | Up to 768kHz/32-bit, DSD512 |
| Coaxial Out | Up to 384kHz/24-bit, DSD128 |
| 3.5mm Output (High Gain) | |
| Output Power | 245mW+245mW @ 32Ω; 360mW+360mW @ 16Ω; 30mW+30mW @ 300Ω |
| SNR | ≥124dB (A-weighted) |
| THD+N | <0.0012% |
| Output Impedance | <1Ω |
| 4.4mm Balanced Output (High Gain) | |
| Output Power | 700mW+700mW @ 32Ω; 605mW+605mW @ 16Ω; 80mW+80mW @ 300Ω |
| SNR | ≥129dB (A-weighted) |
| THD+N | <0.0006% |
| Output Impedance | <1.5Ω |
| Connectivity | |
| Bluetooth 5.0 Transmit | LDAC, LHDC, aptX HD, aptX, AAC, SBC |
| Bluetooth 5.0 Receive | LDAC, AAC, SBC |
| Wi-Fi | 2.4GHz/5GHz, DLNA, AirPlay |
| Ports | USB-C, 3.5mm (shared coaxial/line out), 4.4mm balanced (shared line out) |
| Storage and Battery | |
| Configurations | 3GB+32GB (about 22GB usable) or 4GB+64GB (about 52GB usable) |
| microSD | Up to 2TB |
| Battery Life, 3GB+32GB | About 12.5h (3.5mm), 9.5h (4.4mm) |
| Battery Life, 4GB+64GB | About 16h (3.5mm), 12.5h (4.4mm) |
| Physical Specifications | |
| Display | 4.7-inch, 750x1334 |
| Dimensions | About 120.7 x 68 x 13mm |
| Weight | About 156g |
| Colours Available | Black, Sky Blue |
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