Astell & Kern SR25 Portable Music Player with Quad-Core CPU and Dual DAC

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Astell & Kern SR25 Portable Music Player with Quad-Core CPU and Dual DAC (Moon Silver)
Product ID #: SR25MS
Product Information
Product Information
About Us
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Product Information
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. The SR25 is the latest answer to our never-ending question of "How do we get closer to the original sound the artist intended?"
Features
Quad-Core CPU
Cirrus Logic CS43198 Dual DAC
32bit/384kHz Bit-to-bit Playback
3.6" 720x1280 Touch Display
Aluminum Body
21 Hours Continuous Playback
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 to experience Astell&Kern's flawless sound with Zero Noise on the SR25.
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 playtime 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.
No Compromise on Sound Even When Connected Wirelessly
In addition to 24-bit music playback via aptX 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 with Bluetooth earphones headphones and speakers.
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.
Latest System Optimization 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.
MQA
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 mqa.co.uk for more information. Astell&Kern SR25 includes MQA technology which enables you to playback MQA audio files and streams delivering the sound of the original master recording.
What's in the Box
Portable Player
Charging Cable
Quick Start Guide
Specifications
Body Material: Aluminum
Display: 3.6inch WVGA (720 x 1280) 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 aptX
TM
HD LDAC)
Dimensions: 2.5 ”(63.5 mm) x 4.26 ”(108.3 mm) x 0.63 ”(16.1 mm)
Weight: about 6.27 oz (about 178 g)
Feature Enhancements: Firmware upgrades supported (OTA)
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
Crosstalk:
-138dB @ 1kHz Unbalanced
-144dB @ 1kHz Balanced
THD+N:
0.0007% @ 1kHz Unbalanced
0.0008% @ 1kHz Balanced
IMD SMPTE:
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: 25ps(Typ)
Reference Clock Jitter: 200 Femto Seconds
Capacity: 3150mAh 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: 64GB [NAND]
External Memory: microSD (Max. 1TB) x1
Supported OS: Windows 7810 (32/64bit) MAC OS X 10.7 and up
About Us
About Us
World Wide Stereo:
Awe Inspired. Since 1979.
Specializing in the retail, design, and installation of the finest home and mobile audio, video and automation products in the world. For over three decades, World Wide Stereo has been one of the nation's leading providers of emerging technologies, both cutting edge and practical in the consumer electronics arena. With a reputation for integrity and quality, World Wide Stereo has survived the test of time by offering personal service, award winning installations, and competitive pricing.
World Wide Stereo is proud to be named the Best of Philly for Electronics Stores by Philadelphia Magazine. World Wide Stereo has also received an Excellent Rating from STELLAService and top marks from the Better Business Bureau.
Payment
Payment
Payment is required in full immediately upon winning an auction or selecting "Buy It Now" on an item. Orders where payment is not received within 24 hours can be cancelled for non-payment and the items may be relisted for sale by World Wide Stereo Outlet.
PayPal is our exclusive payment option for all purchases through our eBay store. We can only ship to the confirmed US Paypal Address on your payment. In accordance with applicable state and local laws, we are required to charge sales tax in localities where World Wide Stereo has operations. World Wide Stereo does not benefit from the collection of sales tax and we remit all taxes collected directly to the appropriate taxing jurisdiction.
Returns
Returns
As an authorized dealer, we are proud to offer manufacturer's warranties with your purchase.
The quality of our products is guaranteed. If you are not completely satisfied with your purchase, you may return eligible items*. Returned items must be in their original condition and packaging within 30 days of receipt of your shipment (less applicable shipping and handling costs). In the event where merchandise is not in its original condition or missing packaging, manuals, accessories, or other components a partial refund will be given. Partial refunds are calculated on a case-by-case basis. Buyer pays return shipping on all elective buyer's remorse returns. No returns are accepted after 30 days of delivery.
Eligible items include all items sold by the World Wide Stereo with the exception of:
Televisions larger than 40" in size
Furniture, and oversized product shipped via a motor freight carrier
Car audio equipment that has been installed or where wires have been cut
In-ear headphones
Shipping
Shipping
We can only ship to the confirmed US Paypal Address on your Paypal account. Please confirm your shipping address prior to completing your payment. We offer free ground shipping within the continental US. We do not offer shipping to PO Boxes, AK, HI, APO/FPO, or outside of the US.Most items are shipped within 1 business day of payment (with exception of weekends and holidays) via Fedex. Oversize items ship via motor freight carrier and are indicated in the listing. Freight delivery is by scheduled appointment, normally within 7-10 business days. Please confirm your phone number in your Paypal account prior to completing your payment so we can schedule your appointment.Some shipments may require signature confirmation at delivery. Once your order has shipped it cannot be cancelled or changed.In the event that you refuse your package for any reason other than shipping damages, you will be charged a restocking fee and the full round trip shipping cost. This includes packages that are returned to sender due to non-deliverable addresses.
TVs over 40” are eligible for local pickup only and cannot be shipped. For local pickups, our outlet store is open Monday-Friday 9:00 AM - 4:00 PM ET. For more information, please feel free to contact us at 866.961.7781.
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