Astell&Kern SR25 MKII 64GB Mercury Hi-Fi Music Player

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Colour: Dark Silver

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Astell&Kern | Hifilife Akasya: 0538 013 02 59

Astell&Kern | Hifilife Canyon: 0531 080 80 45

Astell&Kern | Hifilife Panora: 0535 366 34 83

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Astell&Kern SR25 MKII 64GB Mercury Hi-Fi Music Player

A Pocket 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 of 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

Performance Mode for Ultra High Resolution Sound

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

Bit-to-Bit playback is available in models up to the SR25 MKII 32 bit 384 kHz. Native DSD audio is available up to 11.2 MHz, 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 32 bit/384 kHz, you will derive even more pleasure from your music.

Multiple Output Options

The SR25 MKII supports 4.4mm 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 how to listen to it.

Silver Plated Protective Armor

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.

Excellent Continuous Playback Time

TNo need to worry about battery life.
The SR25 MKII can play continuously for 20 hours with just one full charge, thanks to its optimized, 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 also vary depending on user environment.

Wireless Hi-Fi Audio with BT Sink

The newly introduced BT Sink function connects the SR25 MKII to an external device via Bluetooth,
similar to connecting 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 audio sources up to 24-bit/192 kHz.

AK File Drop to enjoy 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 with a 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 of 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
  • Main Body Color: Mercury Silver
  • Main Body Material: Aluminum
  • Display: 6inch HD (720 x 1,280) TFT LCD
  • Supported Audio Formats: WAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, DSF, MQA
  • Sampling Rate:
    • PCM: 8kHz ~ 384kHz (8/16/24/32bits Per Sample)
    • DSD Native: DSD64(1bit 2.8MHz) Stereo and DSD128 (1bit 5.6MHz) Stereo, DSD256 (1bit 11.2MHz), Stereo
  • Output Level:
    • Unbalanced: 0Vrms
    • Balanced: 0Vrms (No Load)
  • Number of Processors: Quad-Core
  • DAC Type and Number: Cirrus Logic CS43198 x2 grain (Dual DAC)
  • Resolution : Up to 32bit / 384Hz Bit-to-Bit Playback
  • Inputs: USB Type-C (For Charging & PC & MAC)
  • Outputs:
    • Unbalanced Output: 5mm jack,
    • Balanced Output: 5mm (only 4-pole supported), 4.4m (only 5-pole supported)
  • Wi-Fi: 11 b/g/n (2.4GHz)
  • Bluetooth: 2 (A2DP, AVRCP, Qualcomm®aptXTM HD, LDAC)
  • Dimensions: 5mm [W] x 108.3mm [H] x 16.1mm [D]
  • Weight: ~ 178g
  • Operating Range: 0~ + 40
  • Frequency range:
    • Unbalanced: ±0.011dB (20Hz~20kHz), ±0.012dB (20Hz~70kHz)
    • Balanced: ±0.014dB (20Hz~20kHz), ±0.010dB (20Hz~70kHz)
  • STNR (Signal to Noise Ratio):
    • Unbalanced: 121dB @ 1kHz
    • Balanced: 123dB @ 1kHz
  • Crosstalk:
    • Unbalanced: -138dB @ 1kHz
    • Balanced: -144dB @ 1kHz
  • THD+N (Total Harmonic Distortion):
    • Unbalanced: 0006% @ 1kHz
    • Balanced: 0005% @ 1kHz
    • Unbalanced: 0004% 800Hz 10kHz(4:1)
    • Balanced: 0003% 800Hz 10kHz (4:1)
  • Output Impedance:
    • Unbalanced: 5mm (1.2 ohms)
    • Balanced: 5mm (1.8 ohm), 4.4mm (1.7 ohm)
  • Clock Jitter Value: 25ps (Typical)
  • Reference Clock Jitter Value: 70ps
  • Battery Capacity: 3,150mAh 3.7V Li-Polymer Battery
  • Usage Time: Up to 20 hours with a single battery (Standard: FLAC, 16bit/44.1kHz, Unbalanced Output, Volume Value 50, EQ Off, LCD On)
  • Charging Time: Up to 5 hours (Standard - 5V/2A with Normal Charge)
  • Internal Memory: 64GB [NAND]
  • External Memory: microSD (Max. 1TB) x1
  • Supported Operating Systems: Windows 8,10 (32/64bit), MAC OS X 10.7 and above

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