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Astell&Kern

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Music Friend In My Pocket, AK70

  • CS4398
    Single DAC
  • 24bit 192kHz
    bit to bit play
  • Balanced
    Output
  • USB Audio
    (Digital Out)
  • AK Connect
    App
  • Metal Body
    (Aluminum)
  • 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.

* 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.

32bit SRC by the AK70
32-bit MQS
32-bit
Delivery
CPU
Conversion to 24bit
24-bit
Delivery
CS4398 DAC
DSD-to-PCM Conversion by the AK70
DSD 64/128
DSD
Delivery
CPU
DSD-to-PCM Conversion
PCM
Delivery
CS4398 DAC

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 MkⅡ
ROXANNEⅡ
LAYLAⅡ
ANGIEⅡ
ROSIE
AK T1p

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.

Portable
AMP

OTG Connector + Regular Cable Connect

Portable
AMP

OTG Cable Connect

USB Audio (Digital Out) Specs
DoP : 2.8MHz / 5.6MHz
PCM : Max 384kHz

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.

PC / MAC

PCM USB

USB Audio Class 1.0 (Max 24bit 96kHz)

Line Out

Headphone

Speaker

Car

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.

Power Connection

AK70

The AK70's Network - AK Connect

The AK70 comes equipped with the AK Connect feature that can be connected with network-ready Astell&Kern devices.

It is also appointed with wireless networking DLNA (Ver. 1.0), which makes it easy to work with NAS/PC on the same network and through an AK Connect app supporting smartphone/tablet computer.

AK500N / SP1000 / AK380 / AK320 / AK300
/ KANN / AK240 / AK120 / AK100 / AK70

DMP

Streaming & Download

DMS

AK70

Phone / Tablet

DMC Streaming DMS
(DMR)
DMS Streaming DMC
(DMR)

Network Player

Streaming DMR DMS
(DMC)
Streaming DMR
Streaming DMR

DMC(DMR)

Streaming & Download

DMS

PC / NAS

DMP (Digital Media Player)
Finds a list of content on a media server for selection and playback
DMS (Digital Media Server = Network Server)
Actually stores the media content to be shared. When connected to a network, the DMS transmits/distributes the media content for other devices to stream or download.
DMC (Digital Media Controller)
Finds a list of content on a media server and establishes a connection to a playback-capable device (renderer). By default, a DMC establishes a connection between a media server and media renderer and controls content playback-related operations.
DMR (Digital Media Renderer = Network Player)
Connects to a media server via media controller for content playback.

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.

[Phone] AK Connect

[Tablet] AK Connect HD

The AK70 supports the Groovers app

You can stream MQS in real time in any place where network is available and download conveniently with easy-to-make payments.
You can also enjoy high-quality music through Groovers' streaming service.

Groovers

Sonodoos

Streaming

AK Jr vs. AK70 vs. AK300

AK Jr AK70 AK300
PCM 24bit 192kHz
Bito to Bit
24bit 192kHz
Bit to Bit
24bit 192kHz
Bit to Bit
DSD DSD to PCM DSD to PCM DSD to PCM
DSD64/128
→ PCM 24bit 176kHz
DSD64/128
→ PCM 24bit 176kHz
DSD64/128
→ PCM 24bit 176kHz
DAC WM8740 x1
(Single DAC)
CS4398 x1
(Single DAC)
AK4490 x1
(Single DAC)
PEQ X X Support
Femto Clock X X Support
USB DAC Max 24bit 96kHz
(UAC 1.0)
Max 24bit 96kHz
(UAC 1.0)
Max 24bit 96kHz
(UAC 1.0)
USB Audio
(Digital Out)
X DSD (DoP) : ~ 5.6MHz
PCM : ~ 384kHz
DSD (DoP) : ~ 5.6MHz
PCM : ~ 384kHz
(future updates)
AK Connect X Support Support
AK AMP X X Support
AK Recorder X X Support
AK CD-RIPPER X Support Support
Built-in Memory 64GB 64GB 64GB