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Music Friend In My Pocket AK70
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  • CS4398 (Single DAC)

    CS4398
    Single 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)

24bit 192kHz bit to bit Playback

The AK70's DAC, based on market-proven CS4398 chips of Cirrus Logic, has been used for years in Hi-Fi audios and the second-generation Astell&Kern devices. The AK70 plays back 24bit 192kHz signals into bit-to-bit type.
32bit audio is downsampled using a sample-rate converter.
In addition, DSD 64/128 can be played back through conversion to PCM.

dac4398

DSD-to-PCM Conversion by the AK70

dac4398

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

AK70's Diverse Output Types - Balanced Output

The AK70 supports the 2.5-mm 4-pole balanced output (2.3 Vrms) that has been in use since the second generation of the Astell&Kern players.
Unlike the unbalanced type, the balanced output type is capable of removing noise (common mode noise) that can occur in “signal + inverting amplifier signal” and has the strength of increasing output due to its double transmitting signals. The AK70 can be used with a variety of balanced earphones and headphones made for Astell&Kern.
It can also support the 3.5-mm 3-pole unbalanced output (2.3 Vrms), with compatibility with a variety of Hi-Fi earphones and headphones.

AK T8iE MK II img
ROXANNE II img
LAYLA II img
ANGIE II img
ROSIE img
AK T1p img

Variety of Output Types of AK70 - USB Audio

The AK70 supports USB audio digital out, first among Astell&Kern devices.
You can connect diverse digital-input portable amps through USB to the AK70.
The AK70 can transfer DSD in native through DoP.
It can also convert DSD into PCM for output for portable amps that do not support DoP. * USB audio output is available only when digital input is possible through USB.
* DoP (DSD over PCM) : This is a standard for transferring DSD data to USB interface. This standard sends DSD data by mounting them onto PCM data frames.
* In order to link the AK70 with a portable amp, one needs OTG cable, which is not included in the AK70 package.
* The cable connecting OTG cable with a portable amp differs depending on the specs of the amp, which is not included in the AK70 package.


img OTG Connector + Regular Cable Connect
img" alt="img"> OTG Cable Connect

Variety of Output Types of AK70 - USB DAC

The AK70 can be used with a USB DAC that can double as an embedded sound card by connecting with a PC/Mac through the USB port. In the case of using the PC's embedded sound card, one may have to go through a complicated process to play back DSD data. In contrast, the AK70 can do so simply by connecting with the PC.

In the case of using the AK70 as a USB DAC, it can support up to 24-bit 96 kHz bit to bit, providing much richer sound through superior ambience and resolution way beyond the limits of an embedded sound card.

* When using the AK70 as a USB DAC, its PEQ settings are not applied, and output up to 24bit, 96kHz is supported.
* DSD 64/128 is converted via DSD-to-PCM for playback.

img

AK CD-RIPPER

The AK70 can allow users to rip CDs with ease by linking with the AK CD-RIPPER. By inheriting from the AK500N, it supports the CD track error correction feature and the meta data (ID3TAG) auto input feature using Gracenote's database without any change.

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

Connect

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 Connet HD

AK Jr vs. AK70 vs. AK300

img

DESIGN

The AK70 is designed with an oblique angle on one side of the body so that it can fit the contour of the user's thumb, the finger used most frequently when controlling the screen with one hand.

The volume wheel is designed to be protruding slightly from a concave surface so that you can control volume with a simple motion of sliding your finger up and down. With slim 13-mm thickness and 132-gram lightweight, the palm-sized device is easy to carry anywhere.
The crown-patterned volume wheel on the right corner is similar in appearance to a cut gemstone, which reflects light from various angles. The sophisticated volume wheel on A&ultima SP1000 not only delivers visual and textual details with precision, but allows convenient, one finger ON/OFF control and fine volume control with the addition of both push and turn features.
The AK70 has adopted a pastel-color anodized aluminum casing, which makes it look high quality with its light mint color and glossy silver tone. The smart-looking exterior and smooth color make the device look more casual and simpler.

Specification

  • General Specifications
    • Model

      AK70

    • Body Color

      Misty Mint

    • Body Material

      Aluminum

    • Display

      3.3inch WVGA (480 x 800) TFT LCD

    • 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, Stereo / DSD128, Stereo

    • Output Level

      Unbalance 2.3Vrms / Balance 2.3Vrms (Condition No Load)

    • DAC

      Cirrus Logic CS4398 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 : 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

      2.37 ”(60.3 mm) [W] x 3.81 ”(96.8 mm) [H] x 0.51 ”(13 mm) [D]

    • Weight

      4.66 oz (132 g)

    • Feature Enhancements

      Firmware upgrades supported (OTA)

  • Audio Performance
    • Frequency Response

      ±0.075dB (Condition: 20Hz~20kHz) Unbalance & Balance
      ±0.56dB (Condition: 10Hz~70kHz) Unbalance / ±0.55dB (Condition: 10Hz~70kHz) Balance

    • Signal to Noise Ratio

      116dB @ 1kHz, Unbalance / 116dB @ 1kHz, Balance

    • Crosstalk

      130dB @ 1kHz, Unbalance / 130dB @ 1kHz, Balance

    • THD+N

      0.0008% @ 1kHz, Unbalance / 0.0007% @ 1kHz, Balance

    • IMD SMPTE

      0.0007% 800Hz 10kHz(4:1) Unbalance / 0.0006% 800Hz 10kHz(4:1) Balance

    • Output Impedance

      Balanced out 2.5mm (1ohm) / PHONES 3.5mm (2ohm)

  • Clock Source
    • Clock Jitter

      50ps (Typ)

  • Battery
    • Capacity

      2,200mAh 3.7V Li-Polymer Battery

  • Memory
    • Built-in Memory

      64GB [NAND]

    • External Memory

      microSD (Max 256GB) x1

  • OS
    • Supported OS

      Windows XP, 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

      $ 599