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Your Next Premium, AK70 MK II
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Back in black and ready to impress! The AK70 MKⅡ has a whole lot to offer with its advanced features.
The AK70 has been reborn as the AK70 MKⅡ through Astell&Kern's accumulated know-how.

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  • Dual DAC separates the left and right audio channels from input to output
  • Higher audio output with the same refined sound signature of Astell&Kern
  • Compact size for easy carrying and one-handed operation
  • CS4398 Dual-DAC

    CS4398
    Dual-DAC

  • 24bit 192kHz bit to bit play

    24bit 192kHz
    bit to bit play

  • Balanced Output

    Balanced
    Output

  • USB Audio (Digital Out)

    USB Audio
    (Digital Out)

  • AK Connect App

    AK Connect
    App

  • Metal Body(Aluminum)

    Metal Body
    (Aluminum)

  • CD-RIPPER (Support)

    CD-RIPPER
    (Support)

Dual DAC and Balanced Out

Dual DAC separates the left and right audio channels from input to output Higher audio output with the same refined sound signature of Astell&Kern Compact size for easy carrying and one-handed operation

Dual DAC'S Balanced Output img
Output from other products img
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Higher audio output with the same refined Astell&Kern sound signature

With a substantial power output of 4.0Vrms from the balanced output, the AK70 MKⅡ can drive a wide range of heavy, hard-to-drive headphones without a problem thanks to Astell&Kern's latest audio design technology.
While maintaining the natural and neutral tone and sound signature Astell&Kern is famous for, the newly designed audio circuit creates authentic sounds by exceeding previous Hi-Fi Audio specifications, including SNR, Crosstalk, and THD+N, over previous models.
The powerful AK70 MKⅡ's sound quality is sure to please even the most discerning music aficionado.

AK70 MKⅡ vs. AK70
AK70 MKⅡ
AK70
  • DAC Dual DAC (Cirrus Logic CS4398 x2) Single DAC (Cirrus Logic CS4398 x1)
  • Output Level Balance 4.0Vrms / Unbalance 2.0Vrms
    (Condition No Load)     Balance 2.3Vrms / Unbalance 2.3Vrms
    (Condition No Load)
  • Signal to Noise Ratio Unbalance 118dB @ 1kHz
    Balance 119dB @ 1kHz     Unbalance 116dB @ 1kHz
    Balance 116dB @ 1kHz
  • Crosstalk Unbalance 136dB @ 1kHz
    Balance 138dB @ 1kHz     Unbalance 130dB @ 1kHz
    Balance 130dB @ 1kHz
  • THD+N Unbalance 0.0005% @ 1kHz
    Balance 0.0005% @ 1kHz     Unbalance 0.0008% @ 1kHz
    Balance 0.0007% @ 1kHz
  • Clock Jitter 45ps(Typ) 50ps(Typ)
  • Battery 2,500mAh 3.7V Li-Polymer 2,200mAh 3.7V Li-Polymer

* SNR (Signal to Noise Ratio): As the signal-to-noise ratio increases, the clearer the sound becomes.
* CROSSTALK: The higher the number in the crosstalk specification, the higher the isolation in the Left/Right channels develops.
* THD+N (THD + Noise, Distortion): over the THD + Noise signal rate, less distortion is heard.
* Jitter: With smaller figures representing irregular tremors of the signal waveform, the better the device performs.

Compact size for easy carrying and one-handed operation

AK70 MKⅡ delivers superb Hi-Fi audio quality in a pocket-sized portable, a must-have feature for listeners who want high quality sound any place and anytime. No need to compromise with lossy, compressed music anymore.

The ergonomic body design fits nicely in the palm of the hand, making operation a smooth, one-handed experience.

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24-bit, 192 kHz Bit-to-Bit Playback

The AK70 MKⅡ plays any resolution of digital files up to 24-bit/192 kHz, bit-for-bit.
32-bit audio and single or double rate DSD can also be played, but it will be converted to PCM or downsampled.

dac4398 * 32-bit, 384 kHz is downsampled to 24-bit, 192 kHz, and 32-bit, 352 kHz is downsampled to 24-bit, 176 kHz for playback.
* DSD 64/128 is converted via DSD-to-PCM to PCM 24-bit, 176 kHz for playback.

DSD-to-PCM Conversion by the AK70 MKⅡ

dac4398

* 32-bit, 384 kHz is downsampled to 24-bit, 192 kHz, and 32-bit, 352 kHz is downsampled to 24-bit, 176 kHz for playback.
* DSD 64/128 is converted via DSD-to-PCM to PCM 24-bit, 176 kHz for playback.

Balanced

The AK70 MKⅡ delivers original sound using the 2.5mm 4-pole balanced output that Astell&Kern first pioneered on the AK240 (and other manufacturers soon adopted). The balanced out provides a more powerful audio signal with less noise interference.

Noise Detected during Balanced Output img
Noise Removed After Detection img
Noise Removal Complete img

USB Audio

A simple USB connection will allow the AK70 MKⅡ to be used as a digital music storage device and/or pre-amp to output digital audio through USB. The AK70 MKⅡ transfers DSD in native format through DoP (DSD over PCM) and converts DSD to PCM for output for external USB Audio that do not support DoP.

* USB audio (Digital Out) output is available only when an external device can accept digital input through USB.
* DoP (DSD over PCM): This is the standard for transferring DSD data to a USB interface and sends DSD data by mounting them onto PCM data frames.
* The type of OTG cable to connect the AK70 MKⅡ with a portable amp differs depending on the specs of the amp. An OTG cable is not included in the AK70 MKⅡ package.

img OTG Connector + Regular Cable Connect
img OTG Cable Connect

USB DAC

Connect to your PC/Mac computer, or other system, via a USB cable and use the AK70 MKⅡ's hardware to provide better sound quality.
The AK70 MKⅡ, when used as a USB DAC, will bring out more detail and provide a better listening experience than your computer is capable of delivering, even when listening to your favorite streaming service!
When using the AK70 MKⅡ as a USB DAC, playback up to 24-bit, 96kHz is supported to deliver a much richer sound through a larger soundstage and resolution that goes far beyond the limits of an embedded sound card.
Want to easily play back DSD on your computer? No problem. Using the PC's embedded sound card usually requires a complicated process to playback DSD data, but with the AK70 MKⅡ, simply install our DAC driver on your PC/MAC and play DSD with ease.

* AK70 MKⅡ supports up to 24-bit 96 kHz with USB audio class 1.0 specs.
* DSD 64/128 is converted via DSD-to-PCM for playback.

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The AK Connect and AK Connect HD apps Download

The AK Connect and AK Connect HD apps are available for download from the Google Play Store and the Apple App Store.

Google Play Store Apple App Store
img [Phone] AK Connect
img [Tablet] AK Connect HD

AK CD-RIPPER

The AK70 MKⅡ allows users to rip CDs with ease by connecting our AK CD-RIPPER accessory. Our exclusive CD-RIPPER can rip your CDs directly to the AK70 MKⅡ with 100% error-correction. When connected to Wi-Fi, all metadata for the CD being ripped will be downloaded from the Gracenote™ database, and all of the tagging information will be stored for each album. The combination of the AK70 MKⅡ and AK CD-RIPPER make it simple and easy to digitize your entire CD collection.

* The AK CD-RIPPER may not be properly recognized when using a power supply adapter rated at less than 5V 2A.

Connect

DESIGN

Specification

  • General Specifications
    • Model

      AK70 MK II

    • Body Color

      Noir Black

    • Body Material

      Aluminum

    • Display

      3.3inch WVGA (480 x 800) TFT LCD

    • Supported Audio Formats

      WAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, DSF

    • Sample rate

      PCM : 8kHz ~ 192kHz (8/16/24bits per Sample)
      DSD : DSD64(1bit 2.8MHz), Stereo / DSD128(1bit 5.6MHz)

    • Output Level

      Unbalance 2.0Vrms / Balance 4.0Vrms (Condition No Load)

    • DAC

      Cirrus Logic CS4398 x2 (Dual DAC)

    • Decoding

      Support up to 24bit / 192kHz Bit to Bit Decoding

    • Input

      USB Micro-B input (for charging & data transfer (PC & MAC)) / Connection Mode : MTP (Media Device)

    • Outputs

      PHONES (3.5mm) / Balanced Out (2.5mm, only 4-pole supported)

    • Wi-Fi

      802.11 b/g/n (2.4GHz)

    • Dimensions

      2.47 ”(62.8 mm) [W] x 3.81 ”(96.8 mm) [H] x 0.59 ”(15.2 mm) [D]

    • Weight

      5.29 oz (150 g)

    • Feature Enhancements

      Firmware upgrades supported (OTA)

  • Audio Performance
    • Frequency Response

      ±0.11dB (Condition: 20Hz~20kHz) Unbalance / ±0.09dB (Condition: 20Hz~20kHz) Balance
      ±0.5dB (Condition: 10Hz~70kHz) Unbalance / ±0.5dB (Condition: 10Hz~70kHz) Balance

    • Signal to Noise Ratio

      118dB @ 1kHz, Unbalance / 119dB @ 1kHz, Balance

    • Crosstalk

      136dB @ 1kHz, Unbalance / 138dB @ 1kHz, Balance

    • THD+N

      0.0005% @ 1kHz, Unbalance / 0.0005% @ 1kHz, Balance

    • IMD SMPTE

      0.0003% 800Hz 10kHz(4:1) Unbalance / 0.0003% 800Hz 10kHz(4:1) Balance

    • Output Impedance

      Balanced out 2.5mm (3ohm) / PHONES 3.5mm (1.5ohm)

  • Clock Source
    • Clock Jitter

      45ps (Typ)

  • Battery
    • Capacity

      2,500mAh 3.7V Li-Polymer Battery

  • Memory
    • Built-in Memory

      64GB [NAND]

    • External Memory

      microSD (Max 256GB) x1

  • OS
    • Supported OS

      Windows 7,8,10 (32/64bit), MAC OS X 10.7 and up

  • Etc.

    • - Audio was NOT muted during the measurement.
      - The image/specification may be changed without notice to improve product performance and quality.

  • Price
    • Price

      $ 699