Astel and Kern SR35
Hi-Fi Sound on-the-go
The A&norma series was created to enjoy the premium sounds of Astell&Kern in a portable size with best in class specifications.
SR25 MKII, the previous model in the series, was loved by audio enthusiasts and those just starting their personal audio journey thanks to its portable size and powerful Hi-Fi sound through a 4.4-mm balanced jack.
The A&norma SR35 inherits these strengths while applying the amplifier and audio design that was applied to Astell&Kern's premium products to deliver the authentic sound quality that Astell&Kern are so well known for. The ultra compact SR35 features 20 hours of continuous playback, while supporting Quad DAC and two-step Gain control, and the A&norma line's first introduction of New Generation Amp technology with Astell&Kern's long-standing know-how for an even more delicate and clear Hi-Fi sound at higher output.
We have also applied our new UI/UX with improved visuals and usability to the SR35 for a more immersive music experience. In addition to this the SR35 is equipped with Roon Ready and MQA full decoder support to further enhance the performance of our A&norma line.
- Quad-DAC (Quad/Dual Switching Mode)
- New Generation AMP Technology
- 2-Step Gain Mode
- NEW UI/UX - Crimson Theme
- Dual Wi-Fi (2.4 & 5 GHz)
- 20-hour continuous playtime
- Supports two-way Bluetooth and LDAC, aptX™ HD
- Roon Ready (First in A&norma series)
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CS43198
Quad-DAC -
2-Step
Gain -
Dual-Band
Wi-Fi -
aptX™-HD
LDAC -
Roon
Ready -
20hrs
Playback -
MQA
Full Decoder
Quad DAC Mode for True Hi-Fi Sound
For the first time in the A&norma series, the SR35 deploys the CS43198 DAC from Cirrus Logic, in Quad DAC configuration. A very well-received DAC praised for its outstanding spatial sense and resolution.
In addition to this, a new design of audio circuit has been implemented, incorporating Astell&kern’s unique technologies along with the Quad DAC and our patented TERATON ALPHA technology for outstanding advancement in the dynamics, sense of space, resolution, and level of separation. Furthermore, our latest technologically advanced amplification circuitry, which was only available in our flagship products has now been incorporated to the SR35, boasting a dramatically improved and industry leading SNR of 130dB.
A Dual/Quad DAC Switching mode is offered enabling users to adjust and improve power management efficiency, further improving the long continuous playtime, a core feature of the A&norma series.
The SR35 supports Native DSD256 and PCM playback of up to 32 bit/384 kHz allowing you to enjoy true Hi-Fi sound without any restriction and free from distortion.
The Essence of Astell&Kern Technology – Equipped with New generation AMP
Astell&Kern's brand philosophy - refusing to overlook even the smallest differences in sound quality - has been recognized by numerous media and audiophiles through our multiple releases of premium audio players that combine innovative circuits and amplifier technologies.
The SR35 is equipped with New generation AMP technology that was applied to the A&ultima line so that A&norma users can also enjoy the highest level of sound provided by the A&ultima line with this exclusive inhouse technology.
The new generation AMP technology applied to the SR35 is Astell&Kern's unique amplifier design that effectively improves noise reduction at high power output.
With this new technology, the SR35 contains the same amplifier design as the latest A&ultima and A&futura products, completely transforming into an amplifier design worthy of premium audio, from OPAMP selection to component placement and circuit design.
Moreover, in order to reliably operate different impedance output sources, the current handling capability at the output end is increased to maximize the performance of various devices with one SR35.
For seamless use of sensitive IEMs and hard to drive headphones, a device must provide suitable output, respective of the connected device’s specification.
The SR35 supports a 2-step Gain Level mode to create the perfect match for a wide range of headphones and IEMs, maintaining optimal sound output.
The two-step gain setting with "Normal Gain" and "High Gain" modes can generate a high current output to create a powerful sound and excellent driver control.
With up to 6 Vrms from the balanced connections, driving high-impedance headphones has never been easier.
SR25 MKII and SR35 Comparison (Output Level, S/N)
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Output Level Unbal. 2.0Vrms / Bal. 4.0Vrms [Normal] Unbal. 2.1Vrms / Bal. 4.0Vrms
[High] 3.1Vrms / Bal. 6.0Vrms -
S/N 122dB @ 1kHz, Unbalanced
124dB @ 1kHz, Balanced 127dB @ 1kHz, Unbalanced
130dB @ 1kHz, Balanced
Audio Block Diagram
TERATON ALPHA,
The Essence of A&K Audio Technologies
TERATON ALPHA, AK’s ultimate sound solution, makes it possible to realize high output and Quad DAC for a wide variety of earphones and headphones whilst maintaining long playtime with minimal noise. We advanced the A&norma series one step further with audio technologies from other Astell&Kern products that were praised by countless audio lovers and media reviews as well as TERATON ALPHA gained through years of technical research and development.
TERATON ALPHA, engineered through endless research, is Astell&Kern's unique technology that has been designed to produce audio playback that is as close to the original sound through effective power noise removal, efficient power management and unwavering amplification, and a fully converted audio output interface.
The SR35 provides premium-class audio specifications and genuine Hi-Fi sound by Astell&Kern.
Along with the core value of A&norma series that seeks to provide unlimited Hi-Fi audio anywhere and at any time, we offer you the best portability in the digital audio player market, with a class leading long playtime and powerful output.
The compact size of the SR35 fits easily in your pocket and weighing in at only 184g is light enough to carry without any inconvenience.
With a maximum of 20-hour continuous playtime, you can enjoy music without a recharge all day long.
The SR35 is the perfect companion that you can use for long-haul flights as well as full days at work and vacations, guaranteeing you Hi-Fi sound anywhere, anytime.
New Experience, New User Interface
The SR35 comes with a redesigned Crimson-themed UI/UX transforming into a "true music player" for users to deeply connect with their music listening experience.
The new UI/UX is designed so that users can quickly browse music categories and re-discover songs within their music library.
We also added an easy album art search function so that users can re-discover the joy of viewing and interacting with music album art whilst listening to their music.
The crimson theme focuses on edge, simplicity, and dark mode keywords. The color theme of black with red highlights lowers visual fatigue and offers intuitive user experiences, and many other improvements were made to the device’s user-friendliness of app service, artist view, album sorting, and the album art search function.
Immerse yourself in music with the new UI/UX.
Sound Design by DAC Filter
With the SR35, you can pick and choose from four DAC filters to create your own sound style.
Design your own sound with 4 different DAC filters.
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Low Latency Fast Post echo enhances bass sound
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Low Latency Slow Minimal echo reproduces original sound
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Phase Compensated Fast Pre and post echoes make powerful sound
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Phase Compensated Slow Minimal echo reproduces original sound
Roon Ready and MQA Support for Hi-Fi Fans
Roon Ready is a service for Hi-Fi fans who wish to play the best Hi-Fi sound without compromise on various devices through network systems.
Roon Ready, available on some premium audio products, now comes with the A&norma series for the first time, offering you a SR35-controlled network audio system to deliver the best sound quality.
Additionally, it supports the full decoder of MQA 8X so that SR35 can play and stream Hi-Fi MQA sound natively, true to the concept of A&norma that plays original sounds anywhere and at any time.
Dual-band Wi-Fi (2.4/5 GHz)
SR35 offers Dual Band Wi-Fi (2.4/5 Ghz), providing enhanced network performance to enjoy Hi-Fi music through various streaming and Roon Ready services.
Supports Native DSD256, 32bit/384kHz
SR35 supports Native DSD256 and up to 32bit/384kHz with Astell&Kern’s excellent audio technology, allowing you to fully enjoy your favorite music.
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 SR35. * ReplayGain supports up to 24-bit/192 kHz sound sources.
AK File Drop to enjoy wireless transfers
The new AK File Drop function in the SR35 makes file 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.
Wireless Hi-Fi Sound Through BT Sink
BT Sink function connects the SR35 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 SR35 using the BT Sink function.
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MQA (Master Quality Authenticated) is an award-winning British technology that delivers the sound of the original master recording.
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The master MQA file is fully authenticated and is small enough to stream or download. Visit mqa.co.uk for more information.
Astell&Kern SR35 includes MQA technology, which enables you to play back MQA audio files and streams,
delivering the sound of the original master recording.
The MQA logo is a trade mark of MQA Limited. © MQA Limited 2018 -
Qualcomm aptX is a product of Qualcomm Technologies, Inc. and/or its subsidiaries.
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Qualcomm is a trademark of Qualcomm Incorporated, registered in the United States and other countries.
aptX is a trademark of Qualcomm Technologies International, Ltd., registered in the United States and other countries. -
LDAC and LDAC logo are trademarks of Sony Corporation.
Discover more -
Roon Ready network players from our partners have Roon’s high-resolution streaming technology built right in.
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They combine simple setup, daily reliability, and support for the highest level of digital audio performance in the industry.
Every Roon Ready player is certified by Roon to guarantee the same stellar experience, regardless of its manufacturer, its price, or its features.
DESIGN
The SR35 visualizes the powerful portability of the A&norma series into its design.
The intense dynamics of the A&norma series are symbolized as a mighty warrior's sword and shield on the device. The single bold line on the side and the surface that gets bigger at the bottom represent a sword of battle, and the delicately refined volume control and its concave surface symbolize a shield. These symbolic shapes found in the SR35’s design represent a warrior’s powerful force and characteristic.
An "A" pattern on the rear glass creates a sophisticated rectangular pattern. This unique pattern on the SR35 symbolizes the first use of Quad DAC architecture in the A&norma series.
We kept our iconic angular display which works perfectly in the hand, further redefining the characteristic of the series.
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General Specifications
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Model
SR35
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Body Color
Charcoal Gray
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Body Material
Aluminum
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Display
3.6inch HD 720 x 1280 touch screen
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Supported Audio Formats
WAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, DSF
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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
[Normal] Unbalanced 2.1Vrms │ Balanced 4Vrms (Condition No Load)
[High] Unbalanced 3.1Vrms │ Balanced 6Vrms (Condition No Load) -
CPU
Quad-core
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DAC
Ciruss Logic CS43198 x4 (Quad-DAC)
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Decoding
Support up to 32bit / 384kHz Bit to Bit playback
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Input
USB Type-C input (for charging & PC & MAC)
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Outputs
Unbalanced Out (3.5mm), Balanced Out (2.5mm, only 4-pole supported | 4.4m, only 5-pole supported)
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Wi-Fi
802.11 a/b/g/n/ac (2.4&5GHz)
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Bluetooth
V5.0 (A2DP, AVRCP, Qualcomm® aptX™ HD, LDAC)
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Dimensions
2.51” (64mm)[W] x 4.26” (108.3mm)[H] x 0.63” (16.1mm)[D]
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Weight
about 6.49oz (184g)
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Feature Enhancements
Firmware upgrade supported (OTA)
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Operating Temperature
0℃ ~ + 40℃ (32℉~ 104℉)
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Model
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Audio Specifications
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Frequency Response
±0.012dB (Condition : 20Hz~20kHz) Unbalanced │ ±0.011dB (Condition : 20Hz~20kHz) Balanced
±0.125dB (Condition : 20Hz~70kHz) Unbalanced │ ±0.126dB (Condition : 20Hz~70kHz) Balanced -
S/N
127dB @ 1kHz, Unbalanced │ 130dB @ 1kHz, Balanced
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Crosstalk
-133dB @ 1kHz, Unbalanced │ -145dB @ 1kHz, Balanced
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THD+N
0.0005% @ 1kHz, Unbalanced │ 0.0006% @ 1kHz, Balanced
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IMD SMPTE
0.0002% 800Hz 10kHz (4:1) Unbalanced │ 0.0002% 800Hz 10kHz (4:1) Balanced
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Output Impedance
Unbalanced Out 3.5mm (1.1ohm) │ Balanced Out 2.5mm, 4.4mm (2.7ohm)
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Frequency Response
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Clock Source
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Clock Jitter
25pS (Typ)
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Reference Clock Jitter
70ps
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Clock Jitter
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Storage Capacity
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Built-in Memory
64GB [NAND]
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External Memory
Micro SD x1 (Max. 1TB)
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Built-in Memory
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Battery
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Capacity
3,150mAh 3.7V Li-Polymer
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Charge Time
about 2.5hours (5V 2A General Charging)
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Playback Time
about 20hours (Standard : FLAC, 16bit, 44.1kHz, Normal Gain, Unbalanced, Vol.50, LCD Off, Dual DAC Mode)
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Capacity
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Supported OS
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Supported OS
Windows 10, 11(32/64bit) MAC OS X 10.7
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Supported OS