Astell and Kern SR25 MKII - Hi Res Audio Player

The new benchmark in Portable Audio
Manufacturer: Astell & Kern
Availability: 1 in stock
Manufacturer part number: Astell and Kern SR25 MKII
GTIN: 8809755501105
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Building on the success of the SR25, Astell and Kern are forever pushing the boundaries of what is possible in the compact Hi Res portable audio market. The new SR25 MKII has more detail in its sound due to advances in Astell and Kern's audio architecture. An improved file drop system enhances usability and advanced sheilding all add up to the most powerful pocket audio player on the market. 

A Pocket Powerhouse Powerhouse

True to the core values of Astell&Kern, high fidelity sound lies at the heart of the SR25 MKII, delivering exceptional audio performance to a diverse range of music lovers. The most distinctive feature of the Astell&Kern A&norma product line is its compact form factor. However, the SR25 MKII offers more detailed sound than its predecessor, allowing the clear expression fo each and every instrument and vocal note.

The SR25 MKII offers more versatile connectivity options with the addition of a 4.4mm balanced output for the first time in an A&norma player, LDAC as well as Qualcomm aptX HD, which support and deliver true audiophile sound quality.

The SR25 MKII keeps everything we love about the SR25 and adds new design features. It will produce the best sound quality anywhere, anytime.

  • The SR25 MKII is a true mass premium product

  • Improved audio quality compared to the SR25

  • Versatile connectivity, with addition of 4.4mm balanced output support

  • Energy-efficient design resulting in 20 hours of continuous playback

  • Supports two-way Bluetooth and high-definition codecs (Qualcomm aptX HD, LDAC)

  • ReplayGain automatically maintains constant volume


Better Sound, Familiar Feel

Not all DACs sound the same.

The SR25 MKII delivers improved performance across the board compared to the SR25, including bass response, dynamic range, soundstage, imaging and more.

The SR25 MKII utilises Astell&Kern's latest audio design technology for clear and natural high-resolution sound with omre clearly defined upper and lower ranges providing listeners with a deeper, more rounded sound.

The SR25 MKII is capable of bit-to-bit playback for files up to 32bit/384kHz and Native DSD up to 11.2MHz, allowing for uncompressed sound quality, staying true to the artist's original intention, in high-resolution and with minimal distortion.

With seamless playback performance supporting Native DSD256 up to 32bit/384kHz, you will derive even more pleasure from your music.


Multiple Output Options

The SR25 MKII supports 4.4m balanced output. With 2.5mm, 3.5mm and 4.4mm output options, you can connect an even wider variety of devices.

The 4.4mm balanced output provides improved dynamic range and bass response, supports a wide soundstage, offers clear imaging, and captures subtle details in the audio source.

Enjoy your music without worrying about adaptors.


Excellent Continuous Playback Time

No need to worry about battery life.

The SR25 MKII can play continuously for 20 hours with just one full charge, thanks to its optimised, energy-efficient circuitry.

Enjoy your own personal musical performance anytime, anywhere with the SR25 MKII's extended playback time and its portability.

  • Music in FLAC format, 16 bit, 44.1 kHz, unbalanced, volume at 50, EQ Off, LCD Off

  • Playback time may vary depending on the user environment


Silver Plating Shield Can

Astell&Kern products apply shield cans so that noise and electromagnetic interference, which occur when the countless parts are in operation, do not affect the audio block.

The SR25 MKII has taken it a step further by applying highly conductive, hyper-pure silver plating on the existing shield cans for perfect shielding that provides excellent audio performance.


Wireless Hi-Fi Sound Through BT Sink

The newly introduced BT Sink function connects the SR25 MKII to an external device via Bluetooth, similar to connecting to a smartphone with a BT speaker.

Music from an external device, such as a smartphone can now be played back in high-quality on the SR25 MKII using the BT Sink function.


ReplayGain Automatically and Uniformly Adjusts Playback Volume

ReplayGain, which adjusts sound sources with different volumes to an identical level, has been applied. Now, enjoy your own playlists seamlessly through the ReplayGain feature on SR25 MKII.

  • ReplayGain supports up to 24bit/192 kHz sound sources.


Upgrades to Enhance the User Experience

AK File Drop to enjoy the wireless transfers.

The new AK File Drop function in the SR25 MKII makes files transfers easier and more convenient. Using AK File Drop, you can freely transfer files wirelessly through a PC, smartphone, or FTP program located on the same network. Music file management is now possible witha  cableless, wireless solution.



The A&norma SR25 MKII inherits the overall design identity of the A&norma SR25 model, highlighting the rhythmic freedom of music through the harmonious combination of design elements.

The top and bottom edges of the bezel are angled, giving the impression fo a smaller rectangle floating freely inside the chassis. The pattern on the side is designed to draw attention to the volume wheel whilst conveying an impression of sound.



  • Model: SR25 MKII

  • Body Colour: Mercury Dark Silver

  • Body Material: Aluminium

  • Display: 3.6-inch HD 720 x 1280 px touch screen

  • Supported Audio Formats: WAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, DSF

  • Sample rate PCM: 8kHz ~ 384kHz (8/16/24/32bits per Sample) DSD Native: DSD64(1bit 2.8MHz), Stereo / DSD128(1bit 5.6MHz), Stereo / DSD256(1bit 11.2MHz), Stereo

  • Output Level: Unbalanced 2Vrms │ Balanced 4Vrms (Condition No Load)

  • CPU: Quad-core

  • DAC: Ciruss Logic CS43198 x2 (Dual-DAC)

  • Decoding: Support up to 32bit / 384kHz Bit to Bit playback

  • Input: USB Type-C input (for charging & PC & MAC)

  • Outputs: Unbalanced Out (3.5mm), Balanced Out (2.5mm, only 4-pole supported / 4.4m, only 5-pole supported)

  • Wi-Fi: 802.11 b/g/n (2.4GHz)

  • Bluetooth: V4.2 (A2DP, AVRCP, Qualcomm® aptX™ HD, LDAC)

  • Dimensions: 2.5” (63.5mm)[W] x 4.26” (108.3mm)[H] x 0.63” (16.1mm)[D]

  • Weight: about 178g (6.27oz)

  • Firmware upgrade supported: (OTA)

  • Operating Temperature: 0℃ ~ + 40℃ (32℉~ 104℉)


Audio performance

  • Frequency Response:

    • ±0.014dB (Condition : 20Hz~20kHz) Unbalanced │ ±0.011dB (Condition : 20Hz~20kHz) Balanced
    • ±0.010dB (Condition : 20Hz~70kHz) Unbalanced │ ±0.012dB (Condition : 20Hz~70kHz) Balanced
  • S/N:

    • 122dB @ 1kHz, Unbalanced
    • 124dB @ 1kHz, Balanced
  • Crosstalk:

    • -138dB @ 1kHz, Unbalanced
    • -144dB @ 1kHz, Balanced
  • THD+N:

    • 0.0006% @ 1kHz, Unbalanced
    • 0.0005% @ 1kHz, Balanced

    • 0.0004% 800Hz 10kHz (4:1) Unbalanced
    • 0.0003% 800Hz 10kHz (4:1) Balanced
  • Output Impedance:

    • Unbalanced Out 3.5mm (1.2ohm)
    • Balanced Out 2.5mm (1.8ohm), 4.4mm (1.7ohm)

Clock Source

  • Clock Jitter: 25pS (Typ)

  • Reference Clock Jitter: 70ps

Storage Capacity

  • Built-in Memory: 64GB [NAND]

  • External Memory: microSD x1 (Max. 1TB)


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

  • Charge Time: about 2.5hours (5V 2A General Charging)

  • Playback Time: about 20hours (Standard : FLAC, 16bit, 44.1kHz, Unbalanced, Vol.50, EQ Off, LCD Off)

  • Supported OS: Windows 7,8,10(32/64bit) MAC OS X 10.7

  • Included in the box:

    • 1x Astell&Kern A&norma SR25 MKII player
    • 1x USB-C to USB-A cable (1 metre)
    • 3x screen protectors
    • 1x Quick start guide




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Item Condition New
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