Astell&Kern AK Jr Portable High Definition Music Player and DAC -

Astell&Kern AK Jr Portable High Definition Music Player and DAC

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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.

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.

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

Hi-Fi Audio

  • Integrated Wolfson WM8740 DAC allows the player to provide high definition quality and detail, and can be used as an external DAC for PC or Mac.


  • Wirelessly stream music to any Bluetooth compatible device such as headphones, home hi-fi systems, and car stereos.

Storage Space

  • Save high definition lossless music to the 64GB internal flash memory. The player also has a microSD card slot supporting 256GB for expanded storage space

Built-in Rechargeable Battery

  • The built-in rechargeable lithium-polymer battery has a capacity of 1450mAh and can be recharged via USB. Listen continuously for up to 8 hours on a charge

High Output Impedance

  • Headphone Output: up to 2Ω
  • Balanced Output: 1Ω

10 Band EQ

  • Extended frequency control with a 10 band graphic EQ in .5 dB increments. In addition, multiple user EQs are supported so that users may create custom EQs to fit each music genre and change them whenever desired.

Full Touch Screen

  • Smartphone-style controls of the AK Jr with a large 3.1" WQVGA touch screen

Audio Performance

Frequency Response ±0.04 dB (Condition: 20 Hz to 20 kHz) / ±0.3 dB (Condition: 20 Hz to 70 kHz)
Signal to Noise Ratio 112 dB @ 1 kHz
Crosstalk 120 dB @ 1 kHz
THD + N 0.005% @ 1 kHz
IMD SMPTE 0.0006% 800 Hz to 10 kHz(4:1)
Output Impedance 2 ohms

Display 3.1" WQVGA (240 x 400) touchscreen
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)
Output Level 1.95 Vrms
DAC 1 x Wolfson WM8740 x1 (single DAC)
Decoding Support up to 24 bit/192 kHz (bit to bit decoding)
Input USB Micro-B Input: For charging & data transfer (PC & Mac)
Connection Mode: UMS(USB Mass Storage)
Outputs Phones: 3.5 mm
Bluetooth V4.0
Clock Sources Clock Jitter: 50 ps (Typical)
Battery 1,450 mAh 3.7 V Li-Polymer Battery
Memory Built-in Memory: 64 GB NAND
External Memory: 1 x microSD (Max 256 GB)
Supported Operating System Windows XP, Windows 7,8 (32/64 bit)
Mac OS X 10.7 and up
Body Material Aluminum
Dimensions (WxHxD) 2.1 x 4.6 x 0.4" / 5.3 x 11.7 x 0.9 cm
Weight 3.3 oz / 93.0 g

Packaging Information
Package Weight 0.6 lb
Box Dimensions (LxWxH) 7.7 x 4.0 x 0.8"


In The Box
Astell&Kern AK Jr Portable High Definition Music Player and DAC
Micro-USB Cable
Set of Screen Protectors
Limited 1-Year Warranty
10% off Your First Order!