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Astell & Kern AK70 Digital Music Player

ak70

Astell & Kern

Moon Audio

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The AK70 digital music player by Astell & Kern is the newest entry level DAP (digital audio player) in their collection. It is the first music player by AK to offer USB Audio output connectivity. 



  • Plays 24bit 192kHz signals into bit-to-bit type.* 

  • 32bit audio is downsampled using a sample-rate converter

  • DSD 64/128 can be played back by PCM conversion.**

  • Single Cirrus Logic CS4398 DAC chip

  • Offering 64GB of internal memory, you can also expand its storage up to 200GB via the included MicroSD slot. 

  • Wi-Fi compatible, allowing over-the-air firmware updates and playback from DLNA 1.0 servers.

  • Includes both a 2.5mm balanced & 3.5mm standard socket.

  • Output power capable up to 2.3Vrms or equal to the top of the line AK380. 

  • 29% lighter, 17% smaller, 1.9mm thinner compare to AK100ii


* 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.


Astell & Kern AK70 Review - June 2017 by The Absolute Sound
$599.00

Description

Details

Design Concept

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 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.

AK70 plays back 24bit 192kHz signals into bit-to-bit type.

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.

Variety of Output Types of AK70 - USB Audio

AK70 USB Connect Instructions

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.

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.

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.

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.

DMP (Digital Media Player)
Finds a list of content on a media server for selection and playback.

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.

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.

DMR (Digital Media Renderer = Network Player)
Connects to a media server via media controller for content playback.

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.

Q&A

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Features

Additional Info

Specifications

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)
Bluetooth  V4.0 (A2DP, AVRCP, aptX)
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
Body Material  Aluminum
Crosstalk  130dB @ 1kHz, Unbalance / 130dB @ 1kHz, Balance
Supported Audio Formats  WAV, FLAC, WMA, MP3, OGG, APE(Normal, High, Fast), AAC, ALAC, AIFF, DFF, DSF
THD+N  0.0008% @ 1kHz, Unbalance / 0.0007% @ 1kHz, Balance
IMD SMPTE

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

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

Reviews

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