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Astell&Kern A&norma SR25 Review

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Goh Beng Yeow
Goh Beng Yeow
Goh Beng Yeow, the Founder / Editor at Porta-Fi™, is a recipient of the IT Youth Award in Singapore. Twice nominated for EY Entrepreneur of the Year Awards, Beng Yeow has previously founded startups such as PDALive.com, Coded Pixels Consultants and was a Tech writer for TODAY, a national daily newspaper under MediaCorp. Since 2017, he has been writing, editing and producing commentaries, interviews, news and reviews on Porta-Fi™. In 2019, Beng Yeow was appointed Advisor to LHDC™, the industry's latest low latency and high-definition Bluetooth audio codec.

Product Specifications

Astell&Kern A&norma SR25

General Specifications
– Body colours:Moon Silver, Oynx Black
– Body material:Aluminum
– Display:3.6 inch WVGA (720 x 1,280) TFT LCD
– DAC:Cirrus Logic CS43198 x2 (Dual DAC)
– CPU:Quad-Core
– Input:via USB-C Port
– Wi-Fi:802.11 b/g/n (2.4GHz)
– Dimensions:63.5 mm (2.5 “) [W] x 108.3 mm (4.26 “) [H] x 16.1 mm (0.63 “) [D]
– Weight:about 178 g (6.27 oz)
– Feature enhancements:Firmware upgrades supported (via OTA)
 
Audio Specifications
– 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 : 8 kHz ~ 384 kHz (8/16/24/32 bits per Sample) /
DSD Native: DSD64(1 bit 2.8 MHz), Stereo / DSD128 (1 bit 5.6 MHz), Stereo / DSD256 (1 bit 11.2 MHz), Stereo
– Output Level:Unbalanced 2.0 Vrms / Balanced 4.0 Vrms (Condition No Load)
– Decoding:Support up to 32 bit / 384 kHz Bit-to-Bit Playback
– Output:Unbalanced Out (3.5 mm) / Balanced Out (2.5 mm, only 4-pole supported)
– Frequency Response:±0.014 dB (Condition: 20 Hz~20 kHz) Unbalanced / ±0.011 dB (Condition: 20 Hz~20 kHz) Balanced
±0.10 dB (Condition: 20 Hz~70 kHz) Unbalanced / ±0.12 dB (Condition: 20 Hz~70 kHz) Balanced
– Signal to Noise Ratio:122 dB @ 1 kHz, Unbalanced / 123 dB @ 1 kHz, Balanced
– Crosstalk:-138 dB @ 1 kHz, Unbalanced / -144dB @ 1 kHz, Balanced
– THD+N:0.0007% @ 1 kHz, Unbalanced / 0.0008% @ 1 kHz, Balanced
– IMD SMPTE:0.0004% 800 Hz 10 kHz(4:1) Unbalanced / 0.0003% 800 Hz 10 kHz(4:1) Balanced
– Output impedance:Unbalanced Out 3.5 mm (1.8 ohms) / Balanced out 2.5 mm (1.6 ohms)
 
Clock source
– Clock jitter:25 ps (Typ)
– Reference clock jitter:200 Femto Seconds
 
Memory
– Built-in memory:64 GB [NAND]
– External memory:microSD (Max. 1TB) x1
 
Battery Specifications
– Capacity:3,150 mAh 3.7 V Li-Polymer Battery
– Charging time:About 2.5 hours (Standard – 5 V / 2 A Charging)
– Battery life:– About 21 hours (Standard – MUSIC: FLAC, 16-bit/44.1kHz, Unbalance, Volume 50, EQ OFF, LCD OFF)
– Battery charging method:via USB-C Port
 
Bluetooth Specifications
– Bluetooth version:4.2
– Bluetooth codec supported:aptX HD / LDAC
 
What’s in the Box
– A&norma SR-25
– USB-A to USB-C cable
– Protective film
– microSD card slot cover
– Quick start guide
– Warranty card
– Price:– SGD 1,099
– USD 699
 

For more information, visit Astell&Kern’s Website

Part 1: Introduction, Design & Build
Part 2: Usability
Part 3: Sound Quality
Part 4: Product Specifications
Part 5: Review Ratings, Summary

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6 COMMENTS

    • The SR25 would underpower the HD650; my recommendation is to have the HD650 powered by a desktop DAC/Amplifier or a desktop amplifier. Alternatively, if you prefer something portable, you can try the FiiO M15

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