Astell&Kern SR25 DAP Music Player

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Introducing the latest entry level DAP (digital audio player) in the A&norma lin… More details

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Introducing the latest entry level DAP (digital audio player) in the A&norma line from Astell&Kern: the SR25 in Moon Silver, Onyx Black or Carmine Red. Featuring a Quad-Core CPU and CS43198 Dual DAC, the SR25 music player provides premium performance with Native DSD256 and up to 32bit/384kHz. SR25 comes with built-in Nand 64GB Memory, support for the LDAC Bluetooth Codec, and Open App Service compatibility for streaming up to four music services at a time. The powerful battery provides up to 21 hours of continuous playback.

Leather case sold separately.

The New Hi-Fi Standard, A&norma SR25

The SR25 is the second model in the Astell&Kern A&norma standard line. Beginning with the AK70, Astell&Kern's goal was to bring high resolution audio and the Astell&Kern sound to more music lovers. This goal continued with the successor to the AK70, the A&norma SR15, and now evolves further as the SR25, a premium product that fully embraces Astell&Kern's philosophy and technology, now available to the masses.

CS43198 Dual DAC, 32bit/384kHz, Native DSD, Quad Core CPU, 21-hour playback, metal body

The SR25 is the latest answer to our never-ending question, "How do we get closer to the original sound the artist intended?" The SR25 improves on the SR15 by:

  • Adding a new, faster Quad-Core CPU paired with the Dual Cirrus Logic CS43198 Master Hi-Fi level DAC, first used on the SR15
  • Native playback support for DSD256
  • A new class-leading performance mode for ultra-high quality playback without compromise
  • Newly designed circuitry to improve sound quality enhancements
  • Addition of Bluetooth LDAC codec to give users more options for higher quality wireless sound

The essence of Astell&Kern's philosophy that sound quality is never compromised is exemplified in the SR25, which expresses every musical detail and bit-perfect playback as only Astell&Kern can.

Performance Mode for Ultra High Resolution Sound

The SR25 supports native DSD256 and 32bit/384kHz audio for the first time in an Astell&Kern standard product and boasts performance that cannot be compared with other competitors' products.

The SR25, which is smaller than other players, has been developed to achieve stable, ultra-high resolution sound. We have developed a new Performance Mode with the SR25 that automatically optimizes and sets the memory mode in the system according to the data size of the source being played.

As the resolution of the sound source increases, it is necessary to process a large amount of data rapidly. If this part is not optimized, sound breakup may occur. To prevent this, the SR25 uses the new Performance Mode to adjust and optimize the system in order to produce near perfect sound quality when playing back high resolution audio.

Experience ultra-high resolution with the SR25's Performance Mode, which reproduces even the smallest, minute details of the original recording the artist was looking for, without compromise.

32-bit bit-to-bit playback illustration

Perfect Circuit Design for the Highest Sound Quality

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, 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.

Ultra low noise filter application diagram

Embark on a Musical Journey That Lasts the Entire Day

If the power supply's stable design and efficiency are not properly taken into consideration, the input/output voltage difference becomes large, and when the output current is large, the output voltage can become unstable. This leads to excessive noise being generated, which can be a major cause of poor sound quality. In addition, poor power efficiency will result in a shorter playback time.

The SR25 set a big challenge for the Astell&Kern engineering team – add the longest playback time of any previous Astell&Kern product, while maintaining the signature Astell&Kern quality sound, and a low-noise floor.

In the SR25, the team not only applied highly efficient components, but they focused on developing circuit optimizations to get the most out of their performance. The result is up to 21 hours of continuous play time, more than double the previous generation SR15, with no compromise in sound quality. No need to worry about battery life while on your daily journey, just have fun on your Music Trip with the SR25.

LDAC Quality: 990, LDAC Normal: 660, LDAC Connection: 330, SBC Max: 328, SBC Mid: 229
Bluetooth Code Bit-rates Compared (kbps)

No Compromise on Sound, Even When Connected Wirelessly

In addition to 24-bit music playback via aptXTM HD Bluetooth as in previous Astell&Kern players, the SR25 adds LDAC support to give users more options to listen to high resolution audio wirelessly.

Now you can enjoy Astell&Kern's high-quality sound when paired to Bluetooth earphones, headphones and speakers.

21-hour playback compared to SR15 (10 hours), AK70 MK II (10 hours), and AK70 (10 hours)
Standard - MUSIC: FLAC, 16-bit/44.1kHz, Unbalance, Volume 80, EQ OFF, LCD OFF

Astell&Kern's Exclusive Metalworking Technology

Astell&Kern products are often compared to art sculptures, with colorful faces and angles not found in other products. This precise design work is based on Astell&Kern's long accumulated know-how and highly precise metalworking technology.

In order to produce this unique style Astell&Kern is famous for, 5-axis machining is performed instead of traditional 3-axis machining used in general machining. All metal must be processed at once without interruption. In addition to 5-axis machining, Astell&Kern has perfected it's crafting of metal through thousands of hours of trial and error. Only after mastering these techniques that Astell&Kern has developed, can the beauty of the metal shine through.

The vibration-free processing machines used by Astell&Kern are the same ones used by expensive Swiss luxury watch manufacturers. This is reflected in the crafting of the volume wheel which is processed precisely like the crown of a luxury watch for the best operating feel. Astell&Kern products are designed to achieve perfect integration at whatever angle you look at it in your hands.

The Aluminum body on the SR25 provides maximum sound quality, while suppressing noise as much as possible. The use of laser ground extension technology gives you the best sound possible, without interference or distortion.

Astell&Kern combines these small parts to make a big difference in the quality of our products that no other manufacturer can match.

milling and production of the SR25

Optimized for a Better User Experience

The SR25 firmware is based on Android 9.0, which adds a number of behind the scene features and upgrades to provide more stable operation over previous versions of Android OS. The use of Android 9.0 ensures the most popular music streaming apps installed via Open APP will be fully compatible with your Astell&Kern player now and with future app updates.

Astell&Kern customizes Android to provide a fully optimized system and user interface, designed to give users a smooth, fluid musical playback experience.

Using Open APP Service

The Open APP Service enables the user to install specific APK music streaming apps to the device. Copy the desired APK into the Open Service folder of the product and install the relevant App in the Menu-Service of the product.

Using Open APP Service

MQA Technology

MQA (Master Quality Authenticated) is an award-winning British technology that delivers the sound of the original master recording. The master MQA file is fully authenticated and is small enough to stream or download. Visit for more information. Astell&Kern SP1000M includes MQA technology, which enables you to play back MQA audio files and streams, delivering the sound of the original master recording.

MQA logo
The MQA logo is a trademark of MQA Limited. © MQA Limited 2018

Design Concept

The new design of A&norma SR25 incorporates drastic changes without losing the balance between an optimal user experience, looks and keeping the A&norma design identity. The harmonious combination of these various design aspects symbolize the rhythmic feel and freedom of music.

The player features layers of various sized rectangular surfaces with added angles to invoke the sense of pulsating musical rhythm from its design. Precisely milled cuts resemble various reflections of light and create a depth of space around the volume wheel that further emphasizes the bold light reflections that are created at different angles of view on the entire player.

On the back, the bold oblique cut surface of the rear glass meets the triangular shapes that surround the volume wheel. The patterns of the rear glass beautifully express the spreading of light when it is reflected off the surface. The rhythmic pattern on the rear glass will change as light is reflected at different angles.

The new SR25 is ideal for one-handed operation and is a perfect fit no matter which hand you choose to hold it in. The angle of the front screen and extra space around it gives you the perfect grip when it's held.

SR25 Design details
SR25 dimensions blueprint

AK Player Comparison

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Moon Silver
2.5" x 4.26" x 0.63"
6.27 oz
3.6" Touchscreen
HD 720x1280
Quad-Core Dual DAC:
Cirrus Logic CS43198
USB Type-C Input
3.5mm Unbalance
2.5mm Bal. 4-pole
Battery Life
21hr Playback
2.5hr charge (5V/2A)
64GB Internal
microSD ≤1TB
Windows 7, 8, 10 (32/64bit)
MAC OS X 10.7+
Wi-Fi, Bluetooth v4.2
≤32bit / 384kHz
Native DSD256
Frequency Response
Condition: 20Hz-20kHz
±0.014dB Unbalance
±0.011dB Balance
Condition: 20Hz-70kHz
±0.10dB Unbalance
±0.12dB Balance
Output Level
2.0 Vrms Unbalance
4.0 Vrms Balance
1.8 Ohm (3.5mm)
1.6 Ohm (2.5mm)
Dark Gray
2.26" x 3.92" x 0.63"
5.43 oz
3.3" Touchscreen
WVGA 480x800
Quad-Core Dual DAC:
Cirrus Logic CS43198
Micro USB Input
3.5mm Unbalance
2.5mm Balance
Battery Life
11hr Playback
8hr charge (PC)
4.5hr (5V/2A)
64GB Internal
microSD ≤400GB
Windows 7, 8, 10 (32/64bit)
and MAC OS X 10.7+
Wi-Fi, Bluetooth v4.1
≤24bit / 192kHz
Native DSD64
Frequency Response
Condition: 20Hz-20kHz
±0.030dB Unbalance
±0.024dB Balance
Output Level
2.0 Vrms Unbalance
4.0 Vrms Balance
1.1 Ohm (3.5mm)
1.6 Ohm (2.5mm)
Select a DAP to view and compare specifications
Select a DAP to view and compare specifications


Headfonia 2020 Product of the Year Award

Press and Reviews

Astell n Kern Magazine Guide
Astell&Kern Magazine

Guides & Reviews
by Moon Audio

Moon Audio Review
Moon Audio

by Staff
Sep. 2020

Inner Fidelity Review
Inner Fidelity

by Grover Neville
Apr. 2020

Home Theater Preview
Home Theater hi-fi

by Mel Martin
Jun. 2020

Trusted Review
Trusted Review

by Simon Lucas
Jun. 2020

Secrets of Home Theatre and High Fidelity Review
Secrets of HiFi

by Mel Martin
Jul. 2020

Headfonia Review

by Matty Graham
Nov. 2020


Technical Features

Body Color
Moon Silver
Body Material
3.6inch HD (720 x 1280) Touchscreen
2.5" W x 4.26" H x 0.63" D (63.5 x 108.3 x 16.1mm)
6.27 oz (178g)
Supported Audio Formats
MQA Playback
Services (Tidal Masters),Local files, External USB, MQA-CD (ripped)
Built-in Memory
External Memory
microSD (Max 1TB) x 1
Cirrus Logic CS43198 x2 (Dual DAC)
Support up to 32bit / 384kHz Bit-to-Bit Playback
USB Type-C for PC and MAC
Unbalanced Out (3.5mm)
Balanced Out (2.5mm 4-pole)
802.11 b/g/n (2.4GHz)
v4.2 (A2DP, AVRCP, aptX™ HD, LDAC)
Feature Enhancements
Firmware upgrades supported (OTA)
Supported OS
Windows 7,8,10 (32/64bit)
MAC OS X 10.7 and up


Frequency Response
(Condition: 20Hx-20kHz) ±0.014dB Unbalanced / ±0.011dB Balanced
(Condition: 20Hx-70kHz) ±0.10dB Unbalanced / ±0.12dB Balanced
Signal to Noise Ratio
112dB @ 1kHz, Unbalanced
123dB @1kHz, Balanced
0.0007% @ 1kHz, Unbalanced /
0.0008% @ 1kHz, Balanced
0.0004% 800Hz 10kHz(4:1) Unbalanced
0.0003% 800Hz 10kHz(4:1) Balanced
Output Impedance
Unbalanced Out 3.5mm (1.8ohm)
Balanced out 2.5mm (1.6ohm)
Clock Jitter
Reference Clock Jitter
200 Femto Seconds
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 (Condition No Load)
Unbalanced 2.0 Vrms
Balanced 4.0Vrms
Battery Capacity
3,150mAh 3.7V Li-Polymer
Continuous Playback
Up to 21 hours
Charge Time
About 2.5 hours (Standard 5V/2A)

Package Includes

  • SR25
  • USB Type-C Cable
  • Quick Start Guide
  • Warranty Card
  • microSD card slot cover (x2)
  • Protective Film (Front x2, Back x2)
  • one year limited warranty


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