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Astell & Kern AK70 Misty Mint 64GB High-Resolution Audio Player - Warehouse Deal

Astell & Kern

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Condition: Grade T


Trade in (i.e. second hand), see description for details. No warranty included.

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2016 Best Portable Music Player
“As A&K’s new entry-level player, the AK70 had to be better than the last. And better it is”

AV Online

"The sonic improvements made by the AK70 over the Jr are more evolutionary than revolutionary - but that, combined with additional features and a more mature interface, is easily enough to garner another five stars for Astell & Kern."

Customer part exchange item: Product is in good condition with no obvious damages, though may have minor marks not visible in photographs. Tested earphone jack, plays music. Touch screen and buttons all functional. No other function can be guaranteed. Missing Micro-USB cable. Includes: x1 Quick start guide, x2 Front screen protective film, x2 Rear protective film, x1 MicroSD card slot cover (Already inside as default).


The AK70 is designed with an oblique angle on one side of the body so that it can fit the contour of the users 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.

AK70 has adopted a pastel-colour anodized aluminium casing, which makes it look high quality with its light mint colour and glossy silver tone. The smart-looking exterior and smooth colour make the device look more casual and simpler.


  • Tick Class-leading audio quality at this price point
  • Tick 24bit/192kHz DAC design; Bit to Bit playback
  • Tick Widest range of music file format support, including DSD
  • Tick 2.5mm Balanced and standard 3.5mm outputs
  • Tick 64GB of internal memory; micro SD slot for further expansion (264GB+)
  • Tick Wi-Fi connectivity enables easy network streaming & OTA updates
  • Tick Bluetooth support: wirelessly stream to headphones/speakers
  • Tick 3.3in touch screen
  • Tick USB Audio (Digital Out)
  • Tick Casing is machined from a single block of aluminium, finished in ‘minty mist’
  • Tick Also works as a USB DAC, to boost quality of computer-based audio

24bit 192kHz Bit To Bit Playback

The AK70s 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 down sampled using a sample-rate converter. In addition, DSD 64/128 can be played back through conversion to PCM.* 32bit, 384kHz is down sampled to 24bit, 192kHz, and 32bit, 352kHz is down sampled to 24bit, 176kHz for playback.* DSD 64/128 is converted via DSD-to-PCM to PCM 24bit, 176kHz for playback.

AK70s 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 - 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.

Variety Of Output Types - 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 PCs 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.


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 Gracenotes database without any change.* The AK CD-RIPPER may not be properly recognised when using a power supply adaptor rated at less than 5V 2A.

The AK70s 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.

While we do our best to keep this information up to date, please be aware that all specifications are subject to change by the manufacturer at any time.

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)


Model AK70
Body Colour Misty Mint
Body Material Aluminium
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 W x H x D 2.37 ”(60.3 mm) x 3.81 ”(96.8 mm) x 0.51 ”(13 mm)
Weight 4.66 oz (132 g)
Feature Enhancements Firmware upgrades supported (OTA)
Clock Jitter 50ps(Typ)
Capacity 2,200mAh 3.7V Li-Polymer Battery
Built-in Memory 64GB [NAND]
External Memory MicroSD (Max 128GB) x1
Supported OS Windows XP, Windows 7,8,10 (32/64bit), MAC OS X 10.7 and up

While we do our best to keep this information up to date, please be aware that all specifications are subject to change by the manufacturer at any time.

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