Astell&Kern AK240 Blue Note Limited Edition Portable Hi-Fi Audio System with 75 Pre-Loaded Albums (Blue)

Astell&Kern AK240 Blue Note Limited Edition Portable Hi-Fi Audio System with 75 Pre-Loaded Albums (Blue)

Astell&Kern AK240 Blue Note Limited Edition Portable Hi-Fi Audio System with 75 Pre-Loaded Albums (Blue)

Astell&Kern AK240 Blue Note Limited Edition Portable Hi-Fi Audio System with 75 Pre-Loaded Albums (Blue)

Astell&Kern AK240 Blue Note Limited Edition Portable Hi-Fi Audio System with 75 Pre-Loaded Albums (Blue)

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Astell&Kern AK240 overview

  • 1Description

The AK240 Portable Hi-Fi Audio System from Astell&Kern is a media player and USB DAC that supports a wide variety of audio formats including WAV, FLAC, ACC, MP3, WMA, OGG, DSD, and more. It is equipped with a dual DAC Cirrus Logic CS4398 chip that allows for native DSD playback, meaning it does not need to convert DSD files to WAV prior to analog conversion.

The AK240 can be controlled via its 3.3-inch AMOLED touch screen and features a physical volume knob. The unit has 256GB of internal storage, and supports microSD cards up to 128GB, for a total of 384GB of potential storage. Thanks to its streaming capabilities, you are not limited to playback of songs you have on your device, as it can stream tracks from your Mac or PC connected to the same wireless network.

This high-resolution audio player comes pre-loaded with 75 Blue Note jazz albums that have been remastered in the Hi-Res digital format. This collection spans Blue Note's storied history, from Thelonious Monk's first sessions in 1947 to GRAMMY Award-winning jazz phenomenon Gregory Porter’s Liquid Spirit.

Closer to Original Sound
Besides providing a dual DAC setup to create better left and right channel separation with clearer sound quality, the AK240 also uses a balanced output and native DSD playback through the dual DAC setup.
Native DSD Support
DSD (Direct Stream Digital) is a digital audio file format originally developed for SACDs (Super Audio CD). Regular digital audio file formats such as PCM (Pulse Code Modulation) is separated into 65,000 (16-bit) to 16,700,000 (24-bit) of information on the Y axis, and 44,100 (44.1 kHz) to 192,000 (192 kHz) across the X axis for digital signals. DSD files have 1 bit (0s or 1s) for Y axis and is separated into 2,800,000 (2.8 MHz) to 5,600,000 (5.6 MHz) of information for X axis.

Compared to regular audio CDs with 16-bit/44.1 kHz PCM format, SACD's recording frequency goes up to 100 kHz and the dynamic range goes beyond 120 dB while maintaining sound clarity during the transmission.

In order to provide native DSD playback on the AK240, the player uses the Cirrus Logic CS4398 chip in the dual DAC setup with an added exclusive XMOS chip that will allow for Native DSD support.
Unbalanced vs. Balanced Output
The unbalanced method is the most commonly used basic method that consists of "left and right signals + ground line". This setup includes a ground line that 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 that reduces the external noises. The balanced method has a few advantages over the unbalanced method, the first 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% 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.
256GB of Storage
With 256GB of internal memory, about 2,500 MQS (24-bit/96kHz, 4 minute-long, 90MB) songs can be saved. With the addition of a 128GB microSD card, the AK240 can support up to a total memory capacity of 384GB.
MQS Streaming
To listen to your favorite music, you no longer have to turn on your computer, search for your music, wait for the songs to download, connect your player via USB cable, and then wait for the files to transfer to the player. Now with MQS Streaming, you can easily download or stream music directly from the AK240 by having the unit and your computer connected to the same network.
Over-The-Air Upgrade
With a Wi-Fi connection, you can receive instant notifications about new firmware updates and can update your unit whenever and wherever you are.
The Design
The design of the AK240 was derived from the combination of light and shadow. The front asymmetric look of the unit was designed from the shape of the shadow when light was shining on it. This shape strongly represents the Astell&Kern brand which expresses uniqueness and class while strongly protecting the volume knob as well.

There are 2 parts to the design of the volume knob on the AK240. First is the diamond-pattern design on the knob where it is gripped. Second is the fine hairline design at the end of the knob that shines to emphasize the design aesthetic of the AK240. The back of the unit is composed of real carbon fiber plates that blend with the overall AK240 design.
Even though the body of AK240 is just one piece, it goes through 12 stages of production until it is complete. The initial 6 stages involve the original materials being prepared, and the next 6 stages involve putting together all of those original parts.
10-Band 0.5 dB-Step EQ Setting
Accurate EQ setting is available on the AK240 by doubling the bands (from 5 to 10 bands) and halving the dB steps (from 1 dB to 0.5 dB) available. One can also create and save customized preset EQ settings to fit various music genres.
Full Touch Screen
Compared to the AK120, the 3.31 inch AMOLED display on the AK240 is about 82% bigger to provide more information at a glance. With the bigger display, the full touch screen is designed to be easy to navigate, especially for smartphone users.

The playback and volume control buttons have also been upgraded on the AK240. Music tracks with long titles, such as a classical music, are displayed on 2 lines for better navigation. Due to the speedy file scanning functionality, a separate dB scanning function is no longer needed and file search is available for access to music.
The AK240 supports native DSD USB DAC function (DoP method). Through the USB connection, the AK240 can be used as a USB DAC that supports Native DSD playback. The combination of the exclusive DSD chip and the dual DAC in the AK240 improves the playback from most computer sound cards and is able to create a sense of space and deeper sound while listening to your music.
Leather Case
The included case is made with minerva leather, using full vegetable tanning to bring out the special characteristic of leather while creating a natural tanned look. This leather material has a lot of oil in it that will allow the leather to shine the more it is used.

Includes 75 High-Resolution Blue Note Albums

  • 01. Thelonious Monk
  • Genius Of Modern Music Volume One
  • 02. Bud Powell
  • The Amazing Bud Powell
  • 03. Thelonious Monk
  • Genius Of Modern Music Volume Two
  • 04. Miles Davis
  • Miles Davis, Volume 1
  • 05. Miles Davis
  • Miles Davis, Volume 2
  • 06. Horace Silver And The Jazz Messengers
  • Horace Silver And The Jazz Messengers
  • 07. Kenny Dorham
  • Afro-Cuban
  • 08. Sonny Rollins
  • Sonny Rollins
  • 09. Sonny Rollins
  • Sonny Rollins, Vol. 2
  • 10. John Coltrane
  • Blue Train
  • 11. Sonny Rollins
  • Newk's Time
  • 12. Sonny Rollins
  • A Night At The Village Vanguard
  • 13. Lou Donaldson
  • Lou Takes Off
  • 14. Sonny Clark
  • Cool Struttin
  • 15. Cannonball Adderley
  • Somethin' Else
  • 16. Three Sounds
  • Introducing The 3 Sounds
  • 17. Art Blakey & The Jazz Messengers
  • Moanin
  • 18. Horace Silver
  • Blowin' The Blues Away
  • 19. Hank Mobley
  • Soul Station
  • 20. Jimmy Smith
  • Back At The Chicken Shack: The Incredible Jimmy Smith
  • 21. Jimmy Smith
  • Midnight Special
  • 22. Tina Brooks [hi-res audio debuts]
  • True Blue
  • 23. Art Blakey & The Jazz Messengers
  • A Night In Tunisia
  • 24. Hank Mobley
  • Workout
  • 25. Grant Green
  • Green Street
  • 26. Freddie Hubbard
  • Ready For Freddie
  • 27. Art Blakey [hi-res audio debuts]
  • Mosaic
  • 28. Stanley Turrentine
  • That's Where It's At
  • 29. Jackie McLean
  • Let Freedom Ring
  • 30. Herbie Hancock
  • Takin' Off
  • 31. Dexter Gordon
  • Go
  • 32. Sheila Jordan
  • Portrait Of Sheila
  • 33. Freddie Hubbard
  • Hub-Tones
  • 34. Kenny Burrell
  • Midnight Blue
  • 35. Donald Byrd
  • A New Perspective
  • 36. Hank Mobley
  • The Turnaround!
  • 37. Jackie McLean
  • One Step Beyond
  • 38. Dexter Gordon, Bud Powell, Pierre Michelot, Kenny Clarke
  • Our Man In Paris
  • 39. Joe Henderson
  • Page One
  • 40. Herbie Hancock
  • Inventions And Dimensions
  • 41. Jackie McLean
  • Destination... Out!
  • 42. Horace Silver
  • Song For My Father
  • 43. Grant Green
  • Idle Moments
  • 44. Andrew Hill
  • Black Fire
  • 45. Grachan Moncur Ⅲ
  • Evolution
  • 46. Lee Morgan
  • The Sidewinder
  • 47. Art Blakey & The Jazz Messengers
  • Free For All
  • 48. Lee Morgan
  • Search For The New Land
  • 49. Eric Dolphy
  • Out To Lunch!
  • 50. Andrew Hill [hi-res audio debuts]
  • Point Of Departure
  • 51. Wayne Shorter
  • Night Dreamer
  • 52. Herbie Hancock
  • Empyrean Isles
  • 53. Wayne Shorter
  • Juju
  • 54. Wayne Shorter
  • Speak No Evil
  • 55. Herbie Hancock
  • Maiden Voyage
  • 56. Bobby Hutcherson [hi-res audio debuts]
  • Components
  • 57. Lee Morgan
  • Cornbread
  • 58. Horace Silver Quintet
  • The Cape Verdean Blues
  • 59. Wayne Shorter
  • The All Seeing Eye
  • 60. Larry Young
  • Unity
  • 61. Ornette Coleman Trio
  • At The "Golden Circle" Stockholm Vol. 1
  • 62. Ornette Coleman Trio
  • At The "Golden Circle" Stockholm Vol. 2
  • 63. Don Cherry [hi-res audio debuts]
  • Complete Communion
  • 64. Joe Henderson
  • Mode For Joe
  • 65. Wayne Shorter
  • Adam's Apple
  • 66. Cecil Taylor
  • Unit Structures
  • 67. Cecil Taylor
  • Conquistador!
  • 68. Lou Donaldson
  • Alligator Bogaloo
  • 69. McCoy Tyner
  • The Real McCoy
  • 70. Herbie Hancock
  • Speak Like A Child
  • 71. Donald Byrd
  • Black Byrd
  • 72. Marlena Shaw
  • Who Is This B***h, Anyway?
  • 73. Cassandra Wilson
  • New Moon Daughter
  • 74. Norah Jones
  • Come Away With Me
  • 75. Gregory Porter
  • Liquid Spirit


In the Box
Astell&Kern AK240 Blue Note Limited Edition Portable Hi-Fi Audio System with 75 Pre-Loaded Albums (Blue)
  • Minerva Leather Case
  • Limited 1-Year Warranty
  • Table of Contents
    • 1Description

    Astell&Kern AK240 specs

    Frequency Response 20 Hz - 20 kHz

    ±0.3 dB (Condition: 10 Hz to 70 kHz) Unbalance & Balance

    Impedance 1 Ohms ()

    Balanced out 2.5 mm (1 Ohms) / PHONES 3.5 mm (2 Ohms)

    Audio Power Output Not Specified by Manufacturer
    Signal to Noise Ratio 116/117 dB
    Internal Storage Capacity 256 GB
    Flash Media Slot 1 x microSD
    Display 3.31" LCD (480 x 800 Resolution)

    Type: AMOLED

    Formats Supported Audio: WAV, FLAC, WMA, MP3, OGG, APE(Normal, High, Fast), AAC, ALAC, AIFF, DFF, DSF
    Wireless Bluetooth 4.0
    Wi-Fi (802.11b/g/n)
    Connections USB
    Battery 1x Built-In Rechargeable Lithium-Polymer Battery 3250 mAh
    Charging Time Not Specified by Manufacturer
    System Requirements Operating System
    Windows XP, 7, 8
    Mac OS X 10.7 and up

    Supports Windows 10

    Dimensions (W x H x D) 2.6 x 4.2 x 0.7" / 66.0 x 106.7 x 17.8 mm
    Weight 6.5 oz / 184.3 g

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