Overview: The Astell & Kern AK70 MKII is the updated
version of the popular AK70 digital music player. The Mark II has higher output
(than the AK70), dual DACs, better signal-to-noise and THD+N specs, and a higher
capacity battery. This compact digital audio player features durable aluminum
construction, and balanced output. It measures only 2-1/2" (w) x 3-7/8" (h) x
5/8" (d), and weighs just 5.4 ounces. Clear plastic film protectors are included
for the front and back. The AK70 MKII is available in
Cadet Blue and Noir Black.
Dual DACs: The AK70 MKII is equipped with two
Cirrus Logic CS4398 DACs (digital-to-analog converters) that separates the left
and right audio channels from input to output. This Dual DAC design reduces
noise and interference, adds more fidelity and audio output power, to give you
better imaging and a bigger soundstage.
32-Bit to 24-Bit Downsampling: The AK70 MKII offers
32-bit to 24-bit downsampling of music files. 32-bit/384kHz music files are
downsampled to 24-bit/192kHz, while 32-bit/352kHz music files are
downsampled to 24-bit/176kHz for playback.
DSD-to-PCM Conversion: The AK70 MKII features DSD-to-PCM
conversion. It will convert DSD 64/128MHz music files to PCM 24-bit/176kHz
Media File Transfer: You can download digital music files from your
Windows PC or Mac computer to the AK70 MKII through its microUSB port
via the included USB cable. Supported audio formats include WAV, FLAC, WMA, MP3,
OGG, APE, AAC, ALAC, AIFF, DSD (DFF + DSF). The device is compatible with Windows 7, 8,
or 10 (32-bit or 64-bit versions), as well as Mac OS X 10.7 and up.
Built-in Memory + External Storage: The AK70 MKII has a built-in
64GB internal flash memory for downloading and store you digital music files.
You can also insert a microSD card (up to 256 GB) in the memory card slot on the
side of the device for additional storage capacity. You microSD card should be
formatted in FAT32. No memory card is included with the player.
Micro-B USB Port: The Astell & Kern AK70 MKII is fitted with a
Micro-B USB port that can be used for downloading music files from your computer and for charging the
battery with the supplied USB cable. The port also supports USB Audio Out and allows you to use the
AK70 MKII as a USB DAC for your computer.
USB DAC: The USB DAC functionality allows the AK70 MKII to be recognized as
a sound card on a computer. The AK70 MKII is connected to a free USB port on
your Windows PC or Mac computer; the music from your computer is then played
through the AK70 MKII's headphone port for an enhanced listening experience. This USB DAC
connection bypasses the inferior soundcard of your computer or laptop and uses
the AK70 MKII as the USB DAC for better sound quality. It can support up to
24-bit/96kHz bit-to-bit music playback, providing much richer sound through
superior ambience and resolution way beyond the limits of the embedded soundcard
of your computer. You must use a dedicated USB cable, not the Micro-B USB cable
included with the unit (which is used for charging only).
- Computer Requirements: Compatible with Windows PC and Mac
- Windows: 7 (32/64-bit), 8 (32/64-bit), and
- Mac OS: OS X 10.7 (Lion) or later
- Supported Music Files: Supported music files include MP3, WMA,
AAC, WAV, FLAC, ALAC, AIFF, DSD (DFF/DSF), OGG, and APE
- Sample Rate: 44.1 kHz to 96kHz
- Bit Rate: 16-bit or 24-bit
Notes: When using the AK70 MKII as a USB DAC, its PEQ settings are not
applied, and output up to 24-bit/96kHz (not 192kHz) is supported. DSD 64/128MHz
is converted via DSD-to-PCM for playback.
Balanced / Unbalanced Outputs: The Astell & Kern AK70 MKII
a 2.5mm balanced headphone output and a 3.5mm unbalanced headphone output for
connection with a variety of headphones:
- 2.5mm Balanced Jack: The AK70 MKII features a
2.5-mm/4-pole balanced output (4.0 Vrms) for connection with compatible headphones.
Connecting to an external audio device requires that you connect to both the
unbalanced port (ground) and balanced audio port (L/R). The balanced output is capable of removing
noise, and has increased output due to its double
- 3.5mm Unbalanced Jack: The AK70 MKII also features a
3.5-mm/3-pole unbalanced output (2.0 Vrms)
that offers compatibility
with a variety of headphones. The 3.5mm headphone output can
also be used as a fixed line-level output, so you can connect the AK70 MKII to
your home receiver, integrated amplifier, or powered speakers.
Built-In Wi-Fi: The AK70 MKII features built-in 2.4GHz Wi-Fi
(802.11 b/g/n) which allows you to connect to your home's Wi-Fi network
wirelessly with support for AK Connect. The AK Connect feature
lets you connect with network-ready Astell & Kern devices and speakers
Note: Firmware/software updates are done over the AK70
MKII's Wi-Fi network
Bluetooth: The AK70 MKII has built-in Bluetooth 4.0
for connecting a Bluetooth speaker, headphone, or receiver so you can listen to
your digital music files wirelessly. In addition to support for the standard
Bluetooth SBC codec, the AK70 MKII offers support for aptX and aptX HD wireless audio playback for Bluetooth speakers, headphones, and
receivers that also support aptX or apxX HD. Car audio Bluetooth connections are
MQS Streaming Server: The Astell & Kern AK70 MKII can access
and play music files stored on a computer on the same network, as well as output
sound through Astell & Kern speakers. The MQS Streaming Server can be downloaded
and installed on your computer (Windows 7/8/10 and Mac OS X 10.7 or later).
AK Connect App: The AK Connect App is a DLNA-based control
app that lets you play back music data on a NAS drive or PC, or on other Astell
& Kern products. You can also stream music from services such as Tidal. The AK
Connect app is compatible with iPhone, iPad, and iPod touch running iOS 8.0 or
later, and with Android devices running software version 4.2 and up.
User Interface: The AK70 MKII features a high-quality user
interface to make it easy to find and select your music files, change the
volume, and adjust the sound.
- 3.31" LCD Touchscreen: The full-color 3.31" LCD touchscreen
has a resolution of 480 x 800 pixels. The screen displays the title and
artist of the currently playing song, along with elapsed and remaining time,
with the album art in the background. On the touchscreen, you can touch the
Play/Pause, Previous/Rewind, or Next/Fast Forward icons to control playback.
You can make adjustments to the EQ, set the repeat and random modes, and add
the song to a playlist, all using the touchscreen interface.
- Rotary Volume Knob: The AK70 MKII has a side-mounted
analog-style rotary volume knob. The volume control range is 0 to 150
with detents at every 1.0. As you adjust the volume, the volume range is
shown numerically on the display.
- Hardware Control Buttons: There are four physical
buttons on the unit: a top-mounted power button, along with side-mounted
Play/Pause, Previous/Rewind, and Next/Fast Forward buttons.
10-Band EQ: The AK70 MKII has a 10-band Equalizer to tailor the
sound of your music to your preference. You can set the levels of each band from
-10dB to +10dB at 32kHz, 62Hz, 125Hz, 250Hz, 500Hz, 1kHz, 2kHz, 4kHz, 8kHz and
Gapless Playback: Gapless Playback allows you to play the
next song without any interruptions or silence. Gapless playback is only
supported between two audio files with identical bit rates, sample rates, and
Power Requirements: The AK70 MKII is equipped with a rechargeable
Lithium-Polymer battery (2500mAh/3.7V). The battery charges via USB in about 8
hours using a USB port on your computer or about 4-1/2 hours using a 5V/2A USB/AC power
adapter (sold separately). A 39" Micro-B cable is included to connect
the player to your charging device. A fully charged battery can provide up to
approximately 10 hours of continuous playback time.
Optional CD-Ripper (Sold Separately): The AK70 MKII can allow users to rip
CDs with ease by linking with the AK CD-Ripper (sold separately). 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.