Cirrus Logic CS4398
Dual DAC Chip
Battery Capacity of
Astell&Kern AK70 MKII is nothing short of a musical powerhouse. It consistently delivers outstanding audio with the ability to use balanced IEMs and headphones and a host of other features. All this in a stylish form factor - truly remarkable!
Headphone Zone Certified Unboxed Units
Unboxed units are as good as new products with the product's packaging being unavailable. These products give you the same satisfaction of new products - but at down-to-earth prices. Usually, the product's packaging may have gotten damaged in transit. Customers use a product once or twice and then return it with opened up packaging.
Returned headphones are fully functional products that have left the warehouse and therefore can no longer be sold as new as their packaging has been opened. The product may have been used once or twice by the customer who returned it.
Sometimes we receive headphones in damaged packaging due to shipping accidents. These are brand new headphones with cosmetic flaws on the packaging.
Save Upto 15%Since you won't get the original packaging, we give you a good discount compared to a new headphone.
Professionally InspectedA thorough inspection means you receive a 100% working headphone with no sound output issues.
Original WarrantyAll unboxed headphones carry the same warranty period as a brand new headphone would.
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Unchanged Replacement PolicyReceived a defective Unboxed unit? Return it under our Replacement Policy.
ALL Original AccessoriesThe unboxed headphones itself comes with all original accessories.
ASTELL&KERN INTRODUCES THE ALL-NEW SECOND GENERATION AK70 MKII, A PREMIUM DIGITAL AUDIO PLAYER
Astell&Kern is a company based in Gangnam-daero, Seocho-Gu, Seoul, Republic of Korea. Astell&Kern products are the perfect pick for Hi-Fi audio enthusiasts. Astell&Kern is renowned for offering DAPs that have revolutionised the audio industry. The AK70 MKII has a whole lot to offer with its advanced features. The AK70 has been reborn as the AK70 MKII through Astell&Kern's accumulated know-how. It is a power-packed performer with dual Cirrus Logic DAC chips with higher power output with refined sound signature. The AK70 MKII is a premium DAP (Digital Audio Player) that supports 24bit 192kHz bit-to-bit playback fused with AK Connect App, USB Audio (Digital Out) and balanced outputs. AK70 MKII delivers superb Hi-Fi audio quality in a pocket-sized portable device. The Astell&Kern AK70 MKII supports lossless files like WAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, and DSF. It is capable of delivering high-quality sound whenever and wherever you want it. There is no longer a need to settle with compressed, lossy music. For those who prefer wireless, AK has incorporated Bluetooth V4.0 with support for A2DP, AVRCP & aptX HD in the unit.
DELVE INTO YOUR MUSIC WITH AK70 MKII'S DUAL DAC ARCHITECTURE AND EXCEPTIONAL AMPLIFICATION CAPABILITY
At its core, the AK70 MKII boasts a twin DAC architecture. It includes two Cirrus Logic CS4398s chips. A comprehensive stereo 24-bit/192 kHz digital-to-analogue system is the CS4398. Digital de-emphasis, volume control with a half-dB step, ATAPI channel mixing, selectable fast and slow digital interpolation filters, and an oversampled multi-bit delta-sigma modulator with mismatch shaping technology are all features of this D/A system. This technology helps to reduce distortion caused by capacitor mismatch. Following this stage is a multi-element switched capacitor stage and low pass filter with differential analogue outputs. The CS4398 also has a proprietary DSD (Direct Stream Digital) processor that allows for volume control and 50 kHz on-chip filtering without an intermediate decimation stage. It also offers an optional path for direct DSD conversion by directly using the multi-element switched capacitor array. The CS4398 accepts PCM data at sample rates from 32 kHz to 216 kHz; DSD audio data has selectable digital filters, consumes little power, and delivers excellent sound quality. This dual DAC architecture separates the "left" and "right" audio channels from input to output with higher audio output with the same refined sound signature of Astell&Kern. Any digital file resolution up to 24-bit/192 kHz can be played back by the AK70 MKII bit-for-bit. Although it will be downsampled or converted to PCM, 32-bit audio and single or double-rate DSD. Experience pure sonic bliss with the all-new Astell&Kern AK70 MKII.
*32-bit, 384 kHz is downsampled to 24-bit, 192 kHz, and 32-bit, 352 kHz is downsampled to 24-bit, 176 kHz for playback.
*DSD 64/128 is converted via DSD-to-PCM to PCM 24-bit, 176 kHz for playback.
SPECTACULAR AMPLIFICATION WITH HIGHER AUDIO OUTPUT DELIVERS A JITTER-FREE LISTENING EXPERIENCE
Astell&Kern engineers have revisited the design aspect while developing the AK70 MKII. With a substantial power output of 4.0Vrms from the balanced output, the AK70 MKII can drive a wide range of heavy, hard-to-drive headphones without a problem, thanks to Astell&Kern's latest audio design technology. While maintaining the natural and neutral tone and sound signature, Astell&Kern is famous for the newly designed audio circuit that creates authentic sounds by exceeding previous Hi-Fi Audio specifications, including SNR, Crosstalk, and THD+N, over previous models. The powerful AK70 MKII's sound quality will please even the most discerning music enthusiasts. The AK70 MKII delivers original sound using the 2.5mm 4-pole balanced output that Astell&Kern first pioneered on the AK240 (and other manufacturers soon adopted). The "balanced" out provides a more powerful audio signal with less noise interference.
AK70MKII DOUBLES UP AS A USB DAC FOR YOUR DEVICES WITH AK CONNECT AND AK CONNECT HD APP SUPPORT AND CD-RIPPER FUNCTIONALITY
A simple USB connection will allow the AK70 MKII to act as a digital music storage device and pre-amp to output digital audio through USB. The AK70 MKII transfers DSD in native format through DoP (DSD over PCM) and converts DSD to PCM for output for external USB Audio that does not support DoP. Connect to your PC/Mac computer, or another system, via a USB cable and use the AK70 MKII's hardware to provide better sound quality. The AK70 MKII, when used as a USB DAC, will bring out more detail and provide a better listening experience than your computer or any other device. When using the AK70 MKII as a USB DAC, playback up to 24-bit, 96kHz is supported to deliver a much richer sound through a larger soundstage and resolution that goes far beyond the limits of an embedded sound card. DSD data is difficult to playback using the PC's inbuilt sound card, but with the AK70 MKII, you only need to install Astell&Kern's DAC driver on your PC/MAC and play DSD with ease. The AK Connect and AK Connect HD apps are available for download from the Google Play Store and the Apple App Store. The AK70 MKII allows you to; rip CDs by connecting their AK CD-Ripper accessory. Astell&Kern's unique CD-Ripper makes it simple to transfer your CDs to the AK70 MKII with 100% error correction. When Wi-Fi is available with the support for 2.4GHz, the Gracenote™ database will be accessed to download all of the CD's metadata. The AK70 MKII and AK CD-Ripper work together to make it straightforward to digitise your complete CD library.
* USB audio (Digital Out) output is available only when an external device can accept digital input through USB.
* DoP (DSD over PCM): This is the standard for transferring DSD data to a USB interface and sends DSD data by mounting them onto PCM data frames.
* The type of OTG cable to connect the AK70 MKⅡ with a portable amp differs depending on the specs of the amp. An OTG cable is not included in the AK70 MKII package.
* AK70 MKII supports up to 24-bit 96 kHz with USB audio class 1.0 specs.
* DSD 64/128 is converted via DSD-to-PCM for playback.
* The AK CD-RIPPER may not be properly recognized when using a power supply adapter rated at less than 5V 2A.
FEATURES AN LCD DISPLAY FUSED WITH A LI-POLYMER BATTERY AND EXPANDABLE MEMORY SUPPORT WITH A STRAIGHT-EDGED ALUMINIUM CHASSIS AND NUMEROUS OUTPUTS, AND A PROTECTIVE CASE
The Astell&Kern AK70 MKII has a 3.3inch WVGA (480 x 800) TFT (Thin Film Transistor) LCD (Liquid Crystal Display) display that is smooth and responsive. It is a display screen technology used in liquid crystal display (LCD). TFT LCD is an active matrix display that simultaneously retains pixels on a screen while also addressing other pixels. The transistor that controls each TFT LCD pixel causes the pixel to be switched "on" and "off" more quickly. The graphics are simple and unobtrusive, focusing on usability and intuitiveness. It hosts a Li-Polymer battery of 2,500mAh 3.7V and has a built-in storage of 64GB, but the microSD card slot allows you to expand your memory ((Max 256GB) x1) to store lossless files. The AK70 MKII has the same basic look as the original AK70. It has a straight-edged aluminium chassis, with a sloped front and volume knob on the right edge. The left edge has play/pause/skip/rewind keys, a MicroSD slot, Micro USB at the bottom, a power/sleep button on top, and 3.5mm and 2.5mm balanced headphone connections. The Astell&Kern AK70 MKII comes with a PU protective case which is "red" in colour with the packaging to protect the player from dust, scratches, and bumps. The material chosen for this purpose was developed by Synt3, a renowned polyurethane producer based in Milan, Italy. The inputs and outputs are conveniently accessible thanks to the protective case's design.
|BODY COLOUR||Noir Black|
|DISPLAY||3.3inch WVGA (480 x 800) TFT LCD|
|SUPPORTED AUDIO FORMATS||WAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, DSF|
|SAMPLE RATE||PCM: 8kHz ~ 192kHz (8/16/24bits per Sample)
DSD : DSD64(1bit 2.8MHz), Stereo / DSD128(1bit 5.6MHz)
|OUTPUT LEVEL||Unbalance 2.0Vrms / Balance 4.0Vrms (Condition No Load)|
|DAC||Cirrus Logic CS4398 x 2 (Dual 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||2.47 ”(62.8 mm)[W] x 3.81 ”(96.8 mm)[H] x 0.59 ”(15.2 mm)[D]|
|FEATURE ENHANCEMENT||Firmware upgrades supported (OTA)|
|FREQUENCY RESPONSE||±0.11dB (Condition: 20Hz~20kHz) Unbalance / ±0.09dB (Condition: 20Hz~20kHz) Balance
±0.5dB (Condition: 10Hz~70kHz) Unbalance / ±0.5dB (Condition: 10Hz~70kHz) Balance
|S/N||118dB @ 1kHz, Unbalance / 119dB @ 1kHz, Balance|
|CROSSTALK||136dB @ 1kHz, Unbalance / 138dB @ 1kHz, Balance|
|THD+N||0.0005% @ 1kHz, Unbalance / 0.0005% @ 1kHz, Balance|
|IMD SMPTE||0.0003% 800Hz 10kHz(4:1) Unbalance / 0.0003% 800Hz 10kHz(4:1) Balance|
|OUTPUT IMPEDANCE||Balanced out 2.5mm (3ohm) / PHONES 3.5mm (1.5ohm)|
|CLOCK JITTER||45ps (Typ)|
|CAPACITY||2,500mAh 3.7V Li-Polymer Battery|
|BUILT-IN MEMORY||64GB [NAND]|
|EXTERNAL MEMORY||microSD (Max 256GB) x1|
|SUPPORTED OS||Windows 7,8,10 (32/64bit), MAC OS X 10.7 and up|
|MODEL||AK70 MKⅡ Case|
|MATERIAL||LASKINA® polyurethane fabric by Synt3. (Made in Italy)|
|WHAT YOU WILL GET||1. Astell&Kern AK70 MKⅡ Digital Audio Player|
|2. Red PU Case|
|WHAT YOU WILL NOT GET||1. Original packaging of Astell&Kern AK70 MKⅡ Digital Audio Player|
The Ultimate Hi-Fi Audio System
The word Astell means Stars in Latin while the word Kern means Centre and together
Astell&Kern means the centre of music. Astell&Kern products are the perfect pick for Hi-Fi audio
aficionados. Due to the advancement in recording technology, music can be recorded digitally while sounding
as true as a live performance. But most of the time, these high-quality recordings are heard in inferior
audio formats such as MP3 which compromises with the sound quality. Additionally, the soundstage aspect of
the sound is completely lost in the MP3 formats. Therefore Astell&Kern came into existence to address
this issue to revive the amazing sound quality for musicians and audio professionals.
The brand has core values such as: High-Resolution studio quality sound in
audio device, Audio quality without compromise, Design & Engineering Excellence, Craftsmanship & High Quality Materials, State of the art Technology and Innovation at every release.
Specialist Hi-Fi Brand in Digital Audio Player Market
Astell&Kern dedicatedly works on providing naturalistic sound without any kind of distortion so that listeners can hear even the minutest details of a song which they would have otherwise missed. Furthermore, Astell&Kern prides itself on using only the absolute best DAC chips from AKM, ESS or Cirrus Logic. Each DAP is unique and crafted to the highest quality standards.
A Popular Choice for Hi-Res Audio
AstellKern believes in playing Hi-Res music matching the quality of the recording.
This ability to deliver a sound which is close to the live performance is the highlight of Astell&Kern.
This standard of sound quality has been used in audio exhibitions around the world and is appreciated by
audio lovers across the world including the USA, China, Japan, UK, France among others.
All Astell&Kern DAPs employ high quality materials from Aluminum, Stainless Steel, Copper, and Brass. Made in South Korea, all their DAPs provide an overwhelming Power Output based on BAL 2Vrms~12Vrms.
[AK70MKII] MAC OS Driver
AK70MKII is compatible with MAC OS X 10.7 and up.
[How to install the driver for file transfer]
1. Disconnect Device from PC
2. Download the file transfer driver at Android File Transfer site. -> http://www.android.com/filetransfer
3. Install the file downloaded according to the guide of website.
4. Use Device after connection with PC.