Astell&Kern AK100 II // Digital Music Player

Rated 5.00 out of 5 based on 1 customer rating
(1 customer review)

Astell&Kern AK100 II // Digital Music Player

$ 899.00 $ 699.00

A new standard for listening to music was proposed while developing the AK100

Astell&Kern recognized that certain aspects of the AK100 needed improvement during research and development for a successor.

While considering how to improve the AK100, Astell&Kern realized that there was a difference between measured audio specifications and what they felt sounded good. After much deliberation, their development efforts were focused on making the AK100 2nd Generation “feel” right to their senses rather than mechanically boosting technical specs. The original AK100 was developed according to audio specification standards, but development of the next-generation AK100 was developed to the “New Standard” of how the music sounds.

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Single DAC and Balanced Out

Although the dramatic depth in sound quality delivered by the Balanced Out was proven in our flagship model, we wondered if the same benefit could be gained by implementing the Balanced Out with a Single DAC. The newly designed demo board delivered the ear-pleasing sound quality we needed. The value of a Balanced Out with a Single DAC is confirmed with every musical note.

The AK100 2nd Generation provides a rich, warm sound experience through the re-tuned A-amp designed specifically for the CS4398 Single DAC.

Unbalanced vs. Balanced Output

The unbalanced method is the most commonly used basic method which consists of “left and right signals + ground line”. This setup includes a ground line which blocks out external noises from the outside. However, since the ground line cannot block out all of the external noises completely, external noises can be mixed into the signals that are transmitted, which then result in changes to the sound. The longer the signals travel, the more external noises that will be mixed into the sound which is why it is used within a short distance of 1 to 2 meters. Unlike the unbalanced method, the balanced method has an additional cold signal to compliment the hot signal which reduces the external noises.


General Specs
Display3.31inch WVGA (480 x 800) AMOLED Touchscreen
Supported Audio FormatsWAV, FLAC, WMA, MP3, OGG, APE(Normal, High, Fast), AAC, ALAC, AIFF, DFF, DSF
Sample rateFLAC, WAV, ALAC, AIFF : 8kHz ~ 192kHz (8/16/24bits per Sample)/ DSD : DSD64 (1bit 2.8MHz), Stereo / DSD128 (1bit 5.6MHz), Stereo
Output LevelUnbalance 2.0Vrms / Balance 1.7Vrms (Condition No Load)
DACCirrus Logic CS4398 x1 (Single DAC)
DecodingSupports up to 24-bit / 192kHz Bit to Bit Decoding
InputsUSB Micro-B input (for charging & data transfer (PC & MAC)) Connection Mode : MTP (Media Device)
OutputsPHONES (3.5mm) / Optical Out (3.5mm) / Balanced Out (2.5mm, only 4-pole supported)
Dimensions2.16”(55 mm) [W] x 4.37”(111 mm) [H] x 0.58”(14.9 mm) [D]
Weight5.99 oz (170 g)
Wi-Fi802.11 b/g/n (2.4GHz)
Feature EnhancementsFirmware upgrades supported (OTA)
Audio Performance
Frequency Response±0.025dB (Condition: 20Hz~20kHz) Unbalance & Balance / ±0.6dB (Condition: 10Hz~70kHz) Unbalance & Balance
Signal to Noise Ratio115dB @ 1kHz, Unbalance / 115dB @ 1kHz, Balance
Crosstalk127dB @ 1kHz, Unbalance / 130dB @ 1kHz, Balance
THD+N0.0009% @ 1kHz, Unbalance / 0.0008% @ 1kHz, Balance
IMD SMPTE0.0004% 800Hz 10kHz(4:1) Unbalance / 0.0003% 800Hz 10kHz(4:1) Balance
Output ImpedanceBalanced out 2.5mm (1ohm) / PHONES 3.5mm (2ohm)
Clock Source
Clock Jitter50ps (Typ)
Capacity3,150mAh 3.7V Li-Polymer Battery
Built-in Memory64GB [NAND]
External MemorymicroSD (Max 128GB) x1
Supported OSWindows XP, Windows Vista,7,8 (32/64bit), MAC OS X 10.7 and up

1 review for Astell&Kern AK100 II // Digital Music Player

  1. Rated 5 out of 5

    Paydental (verified owner)

    Excellent Product
    The quality of this product totally exceeded my expectation, it’s not for the faint of hearts though, if you like listening to mobile music stick to your smartphone works well for you. But if you want to feel Music actually hear each instrument played, purchase HD Songs and play them back on this device. EVERYTHING from the box,to manuals to device screams hi end quality, and feels it as well this model AK100ii weighs more than your smartphone, touchscreen is faster than your smartphone as well. And unlike itunes you never have to worry about cover art, throw the songs on this device and they all show up perfectly.
    Great Product.

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