The Starting Point of Music

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 project gives everyone the opportunity to comfortably listen to high resolution audio, anytime and anywhere.


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.




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.

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)


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.


Model AK Jr
Body Color Sleek Silver
Body Material Aluminum
Display 3.1inch WQVGA (240 x 400) Touchscreen
Supported Audio Format 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) 1.95Vrms
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
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 10,400mAh / 7.4V(normally) / Li-ion 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

Modern Sounds

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Modern Sounds is a division of Signature Audio Video located in Ottawa, Ontario.