Iriver Astell&Kern AK Jr 64GB Portable Hi-Resolution Bluetooth Music Player

US$379.99 US$399.99
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US$379.99 US$399.99

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Product Details

Note:Ship by DHL,FEDEX.


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 converts 2.8 MHz DSD files to PCM.



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.

- The AK Jr's EQ settings are disabled when used as a USB DAC. The USB DAC feature also supports UAC 1.0 (USB Audio Class 1.0 / 24-bit, 96 kHz) audio output.


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)


General Specifications

Model:AK Jr 

Body Color:AK Jr:Black,Silver,Gold.

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) x 4.60” (117 mm) x 0.35” (8.9 mm)

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

External Memory:microSD (Max 64GB) x1



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

Questions & Answers

  • Q: I can buy this on Amazon for $298 us. Im in Shenzhen, whats your best price?
  • A: Hi Greyton,yes,we also can sell 298usd to you.
  • Greyton Becker 9/5/17 9:56 PM Asked.
  • Q: What is your comment if compare this one with Aune M1s?
  • A: Hi Herbert,JR is better Aune M1s.Thank you.
  • Herbert 6/7/17 3:07 AM Asked.