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.
bit to bit play
DSD to PCM
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 converts 2.8 MHz DSD files to PCM.
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 + microSD 256GB
The AK Jr features 64GB of memory to store more music than ever before. Supporting microSD cards up to 256GB, the AK Jr is capable of offering a whopping total storage capacity of 320GB!
The combined 320GB of internal memory and external microSD card capacity is capable of holding more than 3,125 high resolution audio. (Based on one, 4-minute song @ 24 bit/96 kHz, taking up 90MB)
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.
3.1inch WQVGA (240 x 400) Touchscreen
Supported Audio Formats
WAV, FLAC, WMA, MP3, OGG, APE(Normal, High, Fast), AAC, ALAC, AIFF, DFF, DSF
FLAC, WAV, ALAC, AIFF : 8kHz ~ 192kHz (8/16/24bits per Sample) / DSD : DSD64 (1bit 2.8MHz), Stereo (DSD to PCM)
Wolfson WM8740 x1 (Single DAC)
Support up to 24bit/192kHz Bit to Bit Decoding
USB Micro-B input(for charging & data transfer (PC & MAC)) / Connection Mode : UMS(USB Mass Storage)
2.08” (52.9 mm) [W] x 4.60” (117 mm) [H] x 0.35” (8.9 mm) [D]
3.28 oz (93 g)
Firmware upgrades supported (F/W file copy)
±0.04dB (Condition: 20Hz~20kHz) / ±0.3dB (Condition: 20Hz~70kHz)
Signal to Noise Ratio
112dB @ 1kHz
120dB @ 1kHz
0.005% @ 1kHz
0.0006% 800Hz 10kHz(4:1)
- Frequency Response
- Clock Jitter
1,450mAh 3.7V Li-Polymer Battery
microSD (Max 256GB) x1
- Built-in Memory
Windows XP, Windows 7,8 (32/64bit), MAC OS X 10.7 and up
- Supported OS
- Audio was NOT muted during the measurement.
- The image/specification may be changed without notice to improve product performance and quality.