DESCRIPTION

The AK Jr Portable High Definition Music Player and DAC
from Astell & Kern is a pocket-sized audio system capable
of studio Mastering Quality Sound (MQS) support and playback.
MQS is a high definition digital music format operating at
24 bits and sample rates from 96 to 192 kHz, which translates
to distortion-free sound without data loss. MQS sources are
commonly saved as a lossless 24-bit WAV or FLAC files during
record production at the time of the mastering source.
The AK Jr also supports 2.8 MHz DSD64 playback by converting to PCM.

SPECIFICATIONS

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

General Specifications
Display: 3.1" 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: 8 to 192 kHz (8/16/24 bits per sample)
DSD64: 1bit 2.8 MHz Stereo (DSD to PCM)
Output Level: 1.95 Vrms
DAC: 1 x Wolfson WM8740 x1 (single DAC)
Decoding: Support up to 24 bit/192 kHz (bit to bit decoding)
Input: USB Micro-B Input: For charging & data transfer (PC & Mac)
Connection Mode: UMS(USB Mass Storage)
Outputs Phones: 3.5 mm
Bluetooth: V4.0
Clock Sources: Clock Jitter: 50 ps (Typical)
Battery: 1,450 mAh 3.7 V Li-Polymer Battery
Memory: Built-in Memory: 64 GB NAND
External Memory: 1 x microSD (Max 256 GB)
Supported Operating System: Windows XP, Windows 7,8 (32/64 bit)
Mac OS X 10.7 and up
Body Material: Aluminum
Dimensions (WxHxD): 2.1 x 4.6 x 0.4" / 5.3 x 11.7 x 0.9 cm
Weight: 3.3 oz / 93.0 g