Astell&Kern A&norma SR25 High – End Music Player
The New Hi-Fi Standard, A&norma SR25
The SR25 is the second model in the Astell & Kern A & norma standard series.
Starting with the AK70, Astell & Kern's goal was to bring high resolution sound and Astell & Kern quality to more music lovers.
This goal continued with the AK70 successor, the A&norma SR15, and is now further enhanced with the SR25, a premium product that fully embraces Astell & Kern's philosophy and technology, available to the masses.
The SR25 never-ending “How can we approach the original sound the artist intended?” It is the final answer to the question.
The SR25 improves on the SR15:
- New, faster Quad Core CPU paired with the Dual Cirrus Logic CS43198 Master Hi-Fi level DAC first used in the SR15
- Native playback support for DSD256
- New class-leading performance mode for ultra-high quality playback without compromise
- Redesigned circuit to enhance sound quality improvements
- Adding Bluetooth LDAC codec to provide users with higher quality wireless sound and more options
The essence of Astell & Kern's philosophy of never compromising sound quality is exemplified in the SR25, which expresses every musical detail and perfect playing that only Astell & Kern can.
Performance Mode for Ultra High-Resolution Audio
The SR25 supports native DSD256 and 32bit / 384kHz audio for the first time in an Astell & KernÜN entry-level product, with performance that cannot be compared to other competitors' products in the same category.
Smaller than other players, the SR25 has been developed to achieve stable, ultra-high definition sound. With the SR25, we have developed a new Performance Mode that automatically optimizes and adjusts the memory mode in the system based on the data size of the source being played.
As the resolution of the audio source increases, it is necessary to process large amounts of data quickly. If this situation is not optimized, sound degradation may occur. To avoid this, the SR25 uses the new Performance Mode to tune and optimize the system to produce near-perfect sound quality when playing hi-res audio.
Experience ultra-high resolution with the SR25's Performance Mode, which reproduces even the smallest details of the original recording the artist sought without compromise.
Excellent Circuit Design for the Highest Sound Quality
Smooth playback of DSD256 and 32bit/384kHz digital audio requires a high-performance processor and high memory speed. A suitable audio path is required for high-speed signal processing.
Optimizing the length of the audio path is a very important part because if not done properly, an audio delay can occur between signals.
With the SR25, the Astell & Kern team developed a completely different PCB design from the current SR15 to handle high speed signals when needed, resulting in the same audio path lengths and allowing for super high resolution audio without any lag.
In addition, newly designed audio schemes and power circuits have been applied to each channel for distortion-free signal transmission and noise cancellation.
The result is an Ultra Low Noise Filter that lets you experience Astell & Kern's flawless sound with Zero Noise on the SR25.
Embark on an All-Day Musical Journey
If the stable design and efficiency of the power supply is not properly considered, the input / output voltage difference will grow, and when the output current is large, the output voltage may become unstable. This causes excessive noise, which can be a major cause of poor sound quality. Also, lower power efficiency results in shorter playback time.
The SR25 set a big bar for the Astell & Kern engineering team – it increased the longest playtime of previous Astell & Kern products while retaining the signature Astell & Kern quality sound and low noise.
In the SR25, the team not only implemented high-efficiency components, but focused on developing circuit optimizations to get the most out of their performance.
The result is up to 21 hours of continuous playback without sacrificing sound quality, more than double the previous generation SR15.
No need to worry about battery life during your daily travel, have fun on your musical travels with the SR25.
No Compromise on Sound, Even When Connected Wireless
In addition to 24-bit music playback via aptXTM HD Bluetooth like previous Astell & Kern players, the SR25 adds LDAC support to give users more options for wirelessly listening to high-resolution audio.
Now you can enjoy Astell & Kern's high-quality sound when paired with Bluetooth headphones and speakers.
Astell & Kern's Exclusive Metalworking Technology
Astell & Kern products are often compared to art sculptures. This precision design work is based on Astell & Kern's long accumulated know-how and highly precise metalworking technology.
In order for Astell & Kern to produce this unique style, 5-axis machining is used instead of the traditional 3-axis machining used in general machining. All metals must be processed at once without interruption.
In addition to 5-axis machining, Astell & Kern has perfected metalworking with thousands of hours of trial and error. After mastering these techniques developed by Astell & Kern, the beauty of metal was evident.
The vibration-free processing machines used by Astell & Kern are the same ones used by expensive Swiss luxury watchmakers. This is also reflected in the embroidery of the volume wheel, which is rendered like the crown of a luxury watch for the best working feel.
Astell & Kern products are designed to fit perfectly no matter what angle you look at it in your hand.
The aluminum body on the SR25 provides maximum sound quality while suppressing noise as much as possible. The use of laser technology ensures the best possible sound without interference or distortion.
Astell & Kern combines these little pieces to make a huge difference in the quality of our products, where no other manufacturer can rival.
Latest System Optimization for a Better User Experience
The SR25 firmware is based on Android 9.0, which adds behind-the-scenes features and upgrades to ensure more stable operation over previous versions of Android OS. The use of Android 9.0 ensures that most popular music streaming apps installed via Open APP are 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 music playing experience.
Using Open APP Service
Open APP Service allows user to install appAPKs for Andorid music streaming. Copy the desired APK to the Open Service folder of the product
and install the corresponding Application in the Menu Service of the product.
MQA (Master Quality Authenticated) is an award-winning British technology that provides the sound of the original master recording.
The main MQA file is fully verified and small enough to stream or download. Visit mqa.co.uk for more information.
The Astell & Kern SA700 includes MQA technology that lets you play MQA audio files and streams, giving you the sound of the original master recording.
Body Color: Silver
Body Material: Aluminum
Display: 3.6 inch (720 x 1,280) TFT LCD Touchscreen
Supported Audio Formats: WAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, DSF, MQA
MQA playback Services: (Tidal Master), Local files, External USB, MQA-CD
Sampling Rate: PCM: 8kHz ~ 384kHz (8/16/24/32 bits 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)
CPU : Quad Core
DAC : Cirrus Logic CS43198 x2 (Dual DAC)
Audio Decoding: Support up to 32bit/384kHz Bit-to-Bit Playback
Input : USB Type-C input (for PC and MAC)
Output : Unbalanced Output (3.5 mm) / Balanced Output (2.5 mm, only 4 poles supported)
Wi-Fi: 802.11 b/g/n (2.4GHz)
Bluetooth : V4.2 (A2DP, AVRCP, aptX HD, LDAC)
Dimensions : 2.5" (63.5mm) [W] x 4.26" (108.3mm) [H] x 0.63"(16.1mm) [D]
Weight : 178 g (6.27 oz)
Advanced features: Internet update supported (OTA)
Frequency Response: ±0.014dB (Status: 20Hz ~ 20kHz) Unbalanced / ±0.011dB (Status: 20Hz ~ 20kHz) Balanced
±0.010dB (Status: 20Hz ~ 70kHz) Unbalanced / ±0.12dB (State: 20Hz ~ 70kHz) Balanced
Signal to Noise Ratio: 122dB @ 1kHz, Unbalanced / 123dB @ 1kHz, Balanced
Crosstalk: -138dB @ 1kHz, Unbalanced / -144dB @ 1kHz, Balanced
at 1 kHz
THD + N: 0.0007%, Unbalanced / 0.0008% at 1 kHz, Balanced
IMD SMPTE: 0.0004% 800Hz 10kHz (4:1) Unbalanced / 0.0003% 800Hz 10kHz (4:1) Balanced
Output Impedance: Unbalanced Output 3.5mm (1.8ohm) / Balanced output 2.5mm (1.6ohm)
Reference Clock Shifter: 25ps (Typ) / 200 femtoseconds
Capacity : 3.150mAh 3.7V Li-Polymer Battery
Continuous Play Time: Up to 21 hours (Standard – MUSIC: FLAC, 16 bit / 44.1 kHz, Unbalanced, Volume: 50, EQ OFF, LCD OFF)
Charging Time: About 2.5 hours (Standard – 5V / 2A Charging)
Internal Memory: 64GB [NAND]
External Memory: microSD (Max. 1TB) x1
Supported OS: Windows 7,8,10 (32/64bit), MAC OS X 10.7 and above