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Astell&Kern AK Jr Digital Audio Player - Sleek Silver

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Astell&Kern AK Jr Digital Audio Player - Sleek Silver

  • Slimmest profile of any AK player at .35 inches. Full aluminum body & textured volume wheel.

  • Integrated Single Wolfson WM8740 DAC. USB DAC feature fully supported

  • Audio output of 1.95 Vrms. Output impedance of 2 ohms, compatible with a wide variety of headphones.

  • Full single-layer DSD (.DSF & .DFF) playback support (converts to high-res PCM audio). 64GB of internal flash memory + Micro SD card slot (Supports up to 64GB) - Total of 128GB of music storage space.

  • 3.1 inch full LCD touchscreen with responsive interface & 200 x 400 resolution. Intuitive user interface experience combined with an integrated touchscreen & control buttons



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)

Technical Specifications

Additional Information

Web Reviews
Colour Silver
Warranty 1 year (local)
Product Weight (g) 93
Availability Discontinued
Product Type Digital Audio Player
Style/Type Portable
Features Bluetooth, DSD, Expandable Memory/Storage, High-Res Audio Certified, Line-out
Storage Capacity 64GB + up to 64GB
Sampling / Bitrate 8kHz ~ 192kHz (8/16/24bits)
Impedance (Ω) 2ohm
Signal-to-Noise Ratio (SNR) 112dB @ 1kHz
Total Harmonic Distortion (THD) 0.005% @ 1kHz
Input Connectivity 3.5mm stereo, micro-USB
Output Connectivity 3.5mm Stereo
Additional Tech Specs

General Specifications
Model: AK Jr
Body Color: Sleek Silver
Body Material: Aluminum
Display: 3.1inch WQVGA (240 x 400) Touchscreen
Supported Audio Formats (Sample rate): 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)
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: 1,450mAh 3.7V Li-Polymer Battery

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

User Reviews