Astell&Kern AK jr Hi-Res Music Player 64GB

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Exceptional sonic quality

The AK Jr Portable High Definition Music Player and DAC from Astell & Kern is a pocket-sized audio system capable of studio Mastering Quality Sound (MQS) support and playback. MQS is a high definition digital music format operating at 24 bits and sample rates from 96 to 192 kHz, which translates to distortion-free sound without data loss. MQS sources are commonly saved as a lossless 24-bit WAV or FLAC files during record production at the time of the mastering source. The AK Jr also supports 2.8 MHz DSD64 playback by converting to PCM.

Wolfson Chipset

The AK Jr has an integrated single-channel Wolfson WM8740 DAC providing exceptional sonic quality and detail. It can also be used as an external DAC when connected to a Mac or PC via USB. The player features 64GB of internal flash memory and a microSD card slot that supports up to 256GB from a separately sold card. This allows you to store a maximum of 320GB of high definition lossless music.

8 Hours of Playback

The 3.1” WQVGA touchscreen provides smartphone-style control over playback, while the sleek aluminum body and volume wheel provide a smooth analog feel. The built-in battery recharges via USB and lasts for up to 8 hours of playback. The AK Jr ships with a set of screen protectors and micro-USB cable.


  • Mastering Quality Sound (MQS)
  • Supports playback of 24-bit, 96-192 kHz sound files
  • 2.8 MHz DSD playback
  • Integrated Wolfson WM8740 DAC
  • Bluetooth
  • 256GB for expanded storage space
  • Built-in Rechargeable Battery

In the box

  • AK Jr 64GB Hi-Resolution Music Player and DAC
  • Micro USB Cable
  • Set of Screen Protectors
Memory Built-in Memory: 64 GB NAND External Memory: 1 x microSD (Max 256 GB)
Signal to Noise Ratio 112 dB @ 1 kHz
Supported Audio Formats WAV, FLAC, WMA, MP3, OGG, APE (Normal, High, Fast), AAC, ALAC, AIFF, DFF, DSF
Sample Rate FLAC, WAV, ALAC, AIFF: 8 to 192 kHz (8/16/24 bits per sample) DSD64: 1bit 2.8 MHz Stereo (DSD to PCM)
Frequency Response ±0.04 dB (Condition: 20 Hz to 20 kHz) / ±0.3 dB (Condition: 20 Hz to 70 kHz)
THD + N 0.005% @ 1 kHz
Output Impedance 2 ohms
Display 3.1" WQVGA (240 x 400) touchscreen
Warranty 1 Year
MSRP $269.00