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Astell & Kern AK100 II Portable Hi-Fi Sound System (Smokey Blue / Aluminum)

Item # IRAK100II (Part # AK100 II)
Brand new, USA Warranty
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Item Description:
We present "A New Standard in Listening to Music" with the AK100 2nd Generation.

AK100's Next-Gen Evolution - A New Standard in Listening to Music: AK100 II

A New Standard

A new standard for listening to music was proposed while developing the AK100. We recognized that certain aspects of the AK100 needed improvement during research and development for a successor. While considering how to improve the AK100, we realized that there was a difference between measured audio specifications and what we felt sounded good. After much deliberation, our development efforts were focused on making the AK100 2nd Generation "feel" right to our senses rather than mechanically boosting technical specs. The original AK100 was developed according to audio specification standards, but development of the next-generation AK100 was developed to the "New Standard" of how the music sounds.

We present "A New Standard in Listening to Music" with the AK100 2nd Generation.

Single DAC and Balanced Out

Although the dramatic depth in sound quality delivered by the Balanced Out was proven in our flagship model, we wondered if the same benefit could be gained by implementing the Balanced Out with a Single DAC. The newly designed demo board delivered the ear-pleasing sound quality we needed. The value of a Balanced Out with a Single DAC is confirmed with every musical note.

The AK100 2nd Generation provides a rich, warm sound experience through the re-tuned A-amp designed specifically for the CS4398 Single DAC.

Unbalanced vs. Balanced Output

The unbalanced method is the most commonly used basic method which consists of "left and right signals plus ground line". This setup includes a ground line which blocks out external noises from the outside. However, since the ground line cannot block out all of the external noises completely, external noises can be mixed into the signals that are transmitted, which then result in changes to the sound. The longer the signals travel, the more external noises that will be mixed into the sound which is why it is used within a short distance of 1 to 2 meters.

Unlike the unbalanced method, the balanced method has an additional cold signal to compliment the hot signal which reduces the external noises.

The balanced method has a few advantages over the unbalanced method. The first advantage is that the hot signal and the cold signal will remove the external noises received. The second advantage is increased output due to the 2 transmitted signals.

Since the ground line cannot block out 100 percent of the external noises, noise will appear on both the hot and cold signals. The alignment of the 2 signals allows the noise to usually appear at similar points where they will eventually be removed as the signals are transmitted.

5.6 MHz DSD Support

We realized DSD playback through a firmware upgrade for the AK100. However, only 2.8 MHz DSD was supported (88.1kHz PCM conversion/downsampling) due to hardware limitations. Now, 5.6 MHz DSD is supported via 'DSD to PCM' by utilizing a Dual Core CPU.

- - The AK100 2nd Generation is capable of 5.6 MHz DSD playback by converting/downsampling to 176 kHz PCM.


The AK100 2nd Generation fully supports USB DAC.

The AK100 2nd Generation also functions as an external DAC (sound card) when connected to a PC or Mac via USB. The AK100 2nd Generation's sound quality is available for stored music on any PC or Mac as it serves as a built-in sound card.

- - The AK100 2nd Generation supports up to UAC 1.0 (USB Audio Class 1.0) Output (24 bit, 96 kHz) via USB DAC, and EQ settings are not applied.

Network Playback

MQS Streaming
With the next-generation AK100, it's no longer necessary to turn on the PC, search for music, connect a device, and transfer files. Simply connect the AK100 2nd Generation to your PC or Mac via Wi-Fi on the same network and download or stream music wirelessly.

- "Astell&Kern MQS Streaming Server" software must be installed on your PC or MAC with a shared folder saved for MQS Streaming to work.

OTA (Over-The-Air) Upgrade

It has been 14 years since iriver has used the term: firmware.
It already has been 14 years since when our customers had to check their email or look for notifications on the iriver website to look for new firmware. Now, as long as you are connected to Wi-Fi, we notify you of firmware updates as soon as they launch and from wherever you are.

Our users receive firmware updates immediately.

Full Touch Screen

The new AK100 2nd Generation utilizes a 3.31" AMOLED screen, an 82% increase over the previous screen's size. Now, users have access to more on-screen information than ever before. In addition, a full touchscreen means convenient, smartphone-style control.

The Album View screen has been completely overhauled. The larger screen offers a view of six albums compared to the previous version's four, and the album art view offers intuitive search functionality.

Long titles that were limited by a single line are now displayed with two lines in the music list for easier navigation.

Music on the MQS Server can be searched during MQS Streaming in addition to the songs in internal storage.
Now, the songs you desire can be found more easily.

A More Detailed 10-Band 0.5 dB Step EQ

A more accurate EQ setting is available by doubling the bands (from 5 to 10) and halving the dB steps (from 1 dB to 0.5 dB). In addition, multiple user EQs are supported so that users may create custom EQs to fit each music genre and change them whenever desired.

64GB + microSD 128GB

The AK100 2nd Generation includes 64GB of internal flash storage. With the addition of a 128GB microSD card, the AK100 2nd Generation supports up to a total memory of 192GB.

With 64GB of internal memory, the AK120 2nd Generation can store about 625 MQS (24bit/96kHz, 4 minute-long, 90MB) songs.

Design story:

A perfect harmony of engineering and design

With the AK100 2nd Generation, we aimed for the perfect harmony of engineering and design. From beginning to end, we re-examined the PCB layout, the form factor, the materials, and the post-manufacturing process.

Re-examination of the volume wheel's position.

We relocated the volume wheel to the top to maximize the space for the battery. We also redesigned the volume wheel for further convenience and easier usability even when you hold the product with both hands.

Redesign of the volume wheel and guard.

The AK100 2nd Generation's volume wheel consists of two parts: the head and the root. The head is the knurled part and control the volume wheel by holding it securely. The root is the base of the volume wheel and wrapped in a guard that?s directly connected to the hardware. This division into two parts enhances the usability and stability of the AK100 2nd Generation, while the distinguished parts also provide further protection for external damage.

Two layers, two meanings

The AK100 2nd Generation's aluminum body and protector appear like overlapping layers.

For the first layer, we used a luxurious hairline and diamond cut finish for the aluminum body. These two finishing processes add weight to the material while also symbolizing the signature weighty sound provided by Astell & Kern.

The second layer acts as the protector and represents the delicacy of sound provided by Astell&Kern. The three delicate lines that are carved into the protector are reminiscent of string instruments.

The AK100 2nd Generation's design embodies the signature weighty yet delicate sounds of Astell&Kern.

General Specifications:

  • Model: AK100 II
  • Body Color: Smoky Blue
  • Body Material: Aluminum
  • Display: 3.31inch WVGA (480 x 800) AMOLED Touchscreen
  • 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 (1bit 2.8MHz), Stereo / DSD128 (1bit 5.6MHz), Stereo
  • Output Level: Unbalance 2.0Vrms / Balance 1.7Vrms (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) / Optical Out (3.5mm) / Balanced Out (2.5mm, only 4-pole supported)
  • Wi-Fi: 802.11 b/g/n (2.4GHz)
  • Bluetooth: V4.0
  • Dimensions: 2.16" (55 mm) (W) x 4.37" (111 mm) (H) x 0.58" (14.9 mm) (D)
  • Weight: 5.99 oz (170 g)
  • Feature Enhancements: Firmware upgrades supported (OTA)

Audio Performance:

  • Frequency Response: +/- 0.025dB (Condition: 20Hz ~ 20kHz) Unbalance & Balance / ?0.6dB (Condition: 10Hz ~ 70kHz) Unbalance & Balance
  • Signal to Noise Ratio: 115dB at 1kHz, Unbalance / 115dB at 1kHz, Balance
  • Crosstalk: 127dB at 1kHz, Unbalance / 130dB at 1kHz, Balance
  • THD+N: 0.0009 percent at 1kHz, Unbalance / 0.0008 percent at 1kHz, Balance
  • IMD SMPTE: 0.0004 percent 800Hz 10kHz(4:1) Unbalance / 0.0003 percent 800Hz 10kHz(4:1) Balance
  • Output Impedance: Balanced out 2.5mm (1ohm) / PHONES 3.5mm (2ohm)

Clock source:

  • Clock Jitter: 50ps (Typ)


  • Capacity: 3,150mAh 3.7V Li-Polymer Battery


  • Built-in Memory: 64GB [NAND]
  • External Memory: microSD (Max 128GB) x1


  • Supported OS: Windows XP, Windows 7,8 (32/64bit), MAC OS X 10.7 and up


  • 1-Year Astell & Kern USA Warranty


This Kit Includes:

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