Cutting-Edge Performance

At the heart of the JM21 lies an octa‑core Snapdragon 680 built on a 6nm process with Kryo™ 265 architecture, achieving clock speeds up to 2.4GHz. This flagship processor not only delivers a significant performance leap but also maintains low power consumption, setting a new standard for portable audio devices.

Precision Audio Engineering

The JM21 features a fully balanced design driven by dual flagship CS43198 DACs paired with high-performance SGM op‑amps. It supports native USB DAC playback up to 384kHz/32bit and DSD256, ensuring that every note is reproduced with unmatched clarity. Dual custom femtosecond crystal oscillators—engineered with 10ppm low‑temperature drift and ultra‑low phase noise—further guarantee pristine sound quality. Shielded partitions isolate the main control, DAC, and amplifier sections to reduce interference, delivering robust 700mW output per channel.

Optimized Android Experience

Running on a deeply customized Android 13 OS, the JM21 is optimized for a music-centric experience. With 3GB of RAM and 32GB of storage (expandable via microSD up to 2TB), it is designed primarily for streaming music apps, ensuring smooth performance and a distraction-free environment.

Elegant Design & Vibrant Display

Encased in a sleek 13mm ultra‑thin chassis with a premium sky blue finish, the JM21 merges aesthetics with portability. The 4.7‑inch HD display offers clear, vibrant visuals for effortless navigation, and the lightweight construction (approximately 156g) makes it the perfect companion for on‑the‑go listening.

Versatile Connectivity & Enduring Battery Life

Designed to adapt to various audio setups, the JM21 supports multiple connectivity options including SPDIF, USB DAC mode, and both 3.5mm single‑ended and 4.4mm balanced outputs. With working modes spanning Android, Pure Music, and Bluetooth receiving, and a robust 2400mAh battery providing up to 12.5 hours of playback (single‑ended) or 9.5 hours (balanced), it ensures extended, uninterrupted music enjoyment.

Customizable Listening Experience

Catering to different headphone requirements, the JM21 offers three adjustable gain levels and corresponding volume curves for optimal sound quality. Enhanced by WiFi connectivity (supporting 2.4GHz/5GHz, DLNA, AirPlay, and WiFi music transfer), this device is a comprehensive solution for the discerning audiophile.

Technical Details

Color
Sky Blue
Material
Aluminum Alloy + Plastic
Dimensions
~120.7 × 68 × 13 mm
Weight
~156 g (excluding transparent case)
SoC
Qualcomm Snapdragon 680
RAM + Storage
3 GB + 32 GB (approx. 22 GB usable)
Storage Expansion
Standard microSD card slot (up to 2 TB)
Android Version
13
Working Modes
Android / Pure Music / USB DAC
Wi-Fi
2.4 GHz & 5 GHz (supports DLNA, AirPlay, Wi-Fi music transfer, etc.)
DAC
Dual CS43198
Op-Amp
Dual SGM8262
Display
4.7-inch HD (750 × 1334)
Audio Outputs
3.5 mm PO/SPDIF + 4.4 mm Balanced, USB Audio
Bluetooth Version
5
Bluetooth Transmission
SBC, AAC, aptX, aptX HD, LHDC, LDAC
Bluetooth Reception
SBC, AAC, LDAC
Local Decoding
Up to 384 kHz/32-bit, DSD256 (Native)
USB DAC
Up to 384 kHz/32-bit, DSD256 (Native)
USB Audio
Up to 768 kHz/32-bit, DSD512 (DoP/D2P/Native)
Coaxial Output
Up to 384 kHz/24-bit, DSD128 (DoP/D2P)
Output Power (Single-Ended)
L+R ≥ 245 mW + 245 mW (32 Ω / THD+N < 1%)
Output Power (Balanced)
L+R ≥ 700 mW + 700 mW (32 Ω / THD+N < 1%)
SNR
≥130 dB
Noise Floor
<1.5 μV
Output Impedance
<1 Ω
THD+N
<0.0006%
Battery Capacity
2400 mAh
Battery Life
~12.5 h (single-ended), ~9.5 h (balanced)
Charging Time
~2 h (5 V/2 A)
Inside the Box
  • 1x JM21
  • 1x PET film screen protector (pre-applied)
  • 1x Transparent case
  • 1x USB cable
  • 1x Quick start guide
  • 1x Warranty card

30-Day Return Policy

You may return any non-customized product that is still factory sealed, within 30 days upon receiving it. For items that are damaged, incorrect, or faulty upon delivery, Linsoul will assess the issue and provide a solution accordingly.

1 Year Warranty

Most products within our store come with a 1 year warranty. Please check our terms of service to see more.

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