Astell & Kern AK Jr. Portable 64GB High-Resolution Music Player

Model: 3PPE117C-CMSIN1 UPC: 821566015082 Item: 165793

The Astell&Kern AK Jr. Portable High-Resolution Music Player is like taking your favorite personal concert hall wherever you go! It has a built-in 64GB worth of memory for storing over 700 high-resolution audio files, and the capacity to double it with compatible microSD memory cards. Navigating it is a breeze, with the easy-to-use touchscreen menu options. And the built-in DAC makes it so computer-streamed music is heard at the higher quality your audio needs demand.

Astell&Kern AK Jr. Player Features:

  • Built to perform your high-resolution audio files at their peak
  • Store over 700 high-resolution tracks on the built-in storage alone!
  • Use it as a personal DAC to upgrade your music stream from your personal computer
  • Swipe to each track with ease using the LCD touchscreen

Product Information

Astell&Kern AK Jr High-Resolution Music Player Features:

Thin and Light

  • The AK Jr project gives everyone the opportunity to comfortably listen to high resolution audio, anytime and anywhere. Although the Astell&Kern was a portable device, its relatively large size made it less convenient for some. The AK Jr’s compact design delivers the highest sound quality while fitting comfortably in your pocket. The AK Jr is like carrying a small concert in your pocket.

Design Story

  • The AK Jr simplifies complex features of Hi-Fi audio to a smartphone-like experience. The simplified design exemplifies the original concept of the AK Jr. The raised screen provides secure grip and slims down the profile from 8.9mm to 6.9mm. The full aluminum body and textured aluminum volume wheel allows smooth one-handed operation.

Increased output and lowered impedance

  • The AK Jr's output level of 1.95 VRMS represents a 14% increase over the AK100's 1.5 VRMS. Our engineers have reduced the output impedance to 2 Ohms for a significant gain in sound fidelity from the AK100’s 22 Ohms. As the AK Jr supports many various types of earphones and headphones, a separate amplifier is unnecessary.


  • The AK Jr supports DSD, the digital audio format widely considered to be the next-generation in high resolution audio. Listen to a greater range of audio through DSD.


  • The AK Jr can also function as an external DAC (sound card) when connected to a PC or Mac via USB. When playing music stored on a computer, the AK Jr delivers the same high level of audio quality while eliminating the need for a built-in sound card.

Full Touch Screen

  • The AK Jr features a 3.1" LCD touchscreen that is about 1.4 times larger than the AK100’s LCD. The smartphone-like full touch capabilities offer responsive interface and the larger screen displays more information. Album covers that are in a 4:3 format on the AK100 are now displayed 1:1 aspect on the AK Jr’s larger screen.

64GB + 64GB microSD

  • The AK Jr features 64GB of memory to store more music than ever before. Supporting microSD cards up to 64 GB, the AK Jr is capable of offering a whopping total storage capacity of 128 GB! The combined 128GB of internal memory and external microSD card capacity is capable of holding more than 1,250 high resolution audio. (Based on one, 4-minute song @ 24 bit/96 kHz, taking up 90MB)


Astell&Kern AK Jr High-Resolution Music Player Specifications:

General Specifications

  • Model: AK Jr
  • Body Color: Sleek Silver
  • Body Material: Aluminum
  • Display: 3.1inch 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 : 8kHz ~ 192kHz (8/16/24bits per Sample) / DSD : DSD64 (1bit 2.8MHz), Stereo (DSD to PCM)
  • Output Level: 1.95Vrms
  • DAC: Wolfson WM8740 x1 (Single DAC)
  • Decoding: Support up to 24bit/192kHz Bit to Bit Decoding
  • Input: USB Micro-B input(for charging & data transfer (PC & MAC))/ Connection Mode : UMS(USB Mass Storage)
  • Outputs: PHONES (3.5mm)
  • Bluetooth: V4.0 (A2DP, AVRCP)
  • Dimensions: 2.08” (52.9 mm) [W] x 4.60” (117 mm) [H] x 0.35” (8.9 mm) [D]
  • Weight: 3.28 oz (93 g)
  • Feature Enhancements: Firmware upgrades supported (F/W file copy)

Audio Performance

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

Clock Source

  • Clock Jitter: 50ps (Typ)


  • Capacity: 1,450mAh 3.7V Li-Polymer Battery


  • Built-in Memory: 64GB [NAND]
  • External Memory: microSD (Max 64GB) x1


  • Supported OS: Windows XP, Windows 7,8 (32/64bit), MAC OS X 10.7 and up