Astell&Kern SR25 II Deep Blue

Astell&Kern SR25 II Deep Blue



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1 Year Manufacturer's Warranty

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Expandable Storage
Upto 20Hrs Playback
4.4mm Output


Expandable Storage
Upto 20Hrs Playback
4.4mm Output

Why Purchase From Us?

Free UK Delivery - Orders Over £100

1 Year Manufacturer's Warranty

Authorised Partner

Dedicated Support

Many Payment Options inc Klarna



Astell&Kern SR25 MKII Deep Blue Music Player

Astell&Kern have stepped up the SR25 MKII player with the launch of the Astell&Kern SR25 MK II Deep Blue edition. The SR25 MK II fits in the A&norma class of players and is the 2nd player to be launched in this range after the incredible, award winning SR25. It offers up the same dual DAC chip seen in the SR25, however the shielding has been upgraded to offer silver plating on the cans. By switching to the Cirrus Logic and away from the ESS DAC found in other Astell&Kern players, the SR25 MK II maintains incredible, best in class audio like the SE100 yet manages to provide this performance at a lower cost to you. With plenty of power to be paired with many earphones and even some full sized headphones, it makes the SR25 an awesome entry level player for anyone venturing away from using their smartphone for their music playback. The SR25 will enable you to play anything on it from MP3 through to FLAC and all the way up to native DSD if you are so inclined;

The built in 128GB storage enables you to store many of your favourite albums on board, with the ability to add an external 512GB sd card if required. The simplicity of the user interface means that you can access your music and begin listening to it within seconds, thanks in part to its powerful quad core CPU.

Just like the original SR15 the SR25 features the Open App firmware. This lets you install your favourite streaming app directly to the player and enjoy its benefits. This means that If you find that the storage isn’t quite big enough, then you can access millions of songs on TIDAL and stream them directly to the player. This is a subscription service, however it enables you to access all of the latest albums releases along with a curated song list. If you don’t have TIDAL then you can alternatively install music services such as Spotify, which although doesn’t quite offer the same audio quality as TIDAL, manages to provide an extensive database of music to listen to.

The design of the SR25 is somewhat of a talking point with its slanted screen, however, when holding the unit in your hand it means you don’t have to bend your wrist in order for the screen to be straight. It is a design that takes a while to get used to but feels natural after using it for any prolonged period of time. The SR25 has a bigger screen than the SR15 making it much easier to navigate your favourite music.

As with many of the other Astell&Kern range of music players, the SR25 II has no shortage of connections. The SR25 comes sporting a standard unbalanced 3.5mm socket alongside a balanced output on a 2.5mm and 4.4mm socket. The USB output at the base of the unit enables the device to pair up to an external DAC such as a Chord MoJo or a bigger unit such as the Hugo2, Hugo TT2 or even DAVE. (Other DACs are available 🙂 ). For wireless connectivity the SR25 has WiFi and features AptX HD for your wireless headphones. A bonus over the SR15 is the inclusion of the LDAC codec for even better wireless audio transmission to LDAC capable devices. The SR II steps up on the SR25 by offering a different DAC sink featuring multiway, transmission and recieve.

You can be sure to get from London to New York with the SR25 with its 3150+ mAh battery on board offering a best in class 20 hours of music playback, depending on the quality of the music that you are playing through it.

Proper playback of DSD256 and 32bit/384kHz digital audio requires a high-performance CPU and fast memory speed, along with an audio path suitable for high-speed signal processing.

Optimizing the length of the audio path is a very important part, as failing to properly do so can create a time delay between the signals resulting in sound abnormalities.

With the SR25 II, the Astell&Kern team developed a completely different PCB design from the existing SR15 to process the high speed signals where required, resulting in audio path lengths that are the same, allowing for super-high resolution sound without any delay.
Furthermore, newly designed audio patterns and power circuits for distortion-free signal transmission and noise rejection are applied to each channel.

The result is an Ultra Low Noise Filter that allows you experience Astell&Kern’s flawless sound, with Zero Noise, on the SR25.

All in, the SR25 is now one of our best value players and provides you with an incredible entry into the dedicated music player market. The massive storage, streaming and array of connectivity options makes it a sensible purchase for anyone wanting to step away from their iPhone or Smartphone and save it’s battery.


Astel&Kern SR25 MKII Deep Blue General Specifications

Model: SR25 II
Body Colour:  Mercury D, Deep Blue
Body Material: Aluminium
Display: 3.6inch WVGA (720 x 1,280) TFT LCD
Supported Audio Formats:  WAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, DSF, MQA
MQA playback:  Services(Tidal Masters), Local files, External USB, MQA-CD(ripped)
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 2.0Vrms / Balanced 4.0Vrms (Condition No Load)
DAC:  Cirrus Logic CS43198 x2 (Dual DAC)
CPU: Quad-Core
Decoding: Support up to 32bit / 384kHz Bit-to-Bit Playback
Input: USB Type-C input (for PC & MAC)
Outputs: Unbalanced Out (3.5mm) / Balanced Out (2.5mm, only 4-pole supported)
Wi-Fi:  802.11 b/g/n (2.4GHz)
Bluetooth: V4.2 (A2DP, AVRCP, aptXTM HD, LDAC)
Size: 2.5 ”(63.5 mm) [W] x 4.26 ”(108.3 mm) [H] x 0.63 ”(16.1 mm) [D]
Weight: about 6.27 oz (about 178 g)
Feature Enhancements: Firmware upgrades supported (OTA)
Audio Performance
Frequency Response:
±0.014dB (Condition: 20Hz~20kHz) Unbalanced / ±0.011dB (Condition: 20Hz~20kHz) Balanced
±0.10dB (Condition: 20Hz~70kHz) Unbalanced / ±0.12dB (Condition: 20Hz~70kHz) Balanced
Signal to Noise Ratio:
122dB @ 1kHz, Unbalanced / 123dB @ 1kHz, Balanced
-138dB @ 1kHz, Unbalanced / -144dB @ 1kHz, Balanced
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: 200 Femto Seconds
Capacity: 3,150mAh 3.7V Li-Polymer Battery
Continuous Playback Time: About 21 hours (Standard – MUSIC: FLAC, 16-bit/44.1kHz, Unbalance, Volume 50, EQ OFF, LCD OFF)
Charge Time:  About 2.5 hours (Standard – 5V/2A Charging)
Built-in Memory: 128GB [NAND]
External Memory: microSD (Max. 1TB) x1
Supported OS: Windows 7,8,10 (32/64bit), MAC OS X 10.7 and up
Additional information



South Korea

Enclosure Material



3.6inch WVGA (720 x 1280) TFT LCD


Cirrus Logic CS43198 Dual DAC

Continuous Playback Time

up to 20 hours (Standard – MUSIC: FLAC, 16-bit/44kHz, Volume 75, LCD Off)

Built-in Memory

128GB [NAND]

External Memory

microSD (Max 512GB) x1


Native TIDAL, Install Apps, TIDAL Offline

Product Weight



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


Player Only, Player + Denim Blue Case, Player + Orange Case, Player + Black Case

Google Product Name

Astell&Kern SR25 II

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SR25 II Deep Blue

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