A Pocket Powerhouse

True to the core values of Astell&Kern, high fidelity sound lies at the heart of the SR25 MKII, delivering exceptional audio performance to a diverse

range of music lovers. The most distinctive feature of the Astell&Kern A&norma product line is its compact form factor. However, the SR25 MKII offers

more detailed sound than its predecessor, allowing the clear expression of each and every instrument and vocal note.  

The SR25 MKII offers more versatile connectivity options with the addition of a 4.4mm balanced output for the first time in an A&norma player, LDAC,

as well as Qualcomm® aptX™ HD, which support and deliver true audiophile sound quality.   

The SR25 MKII keeps everything we love about the SR25 and adds new design features. It will produce the best sound quality anywhere, anytime.

• The SR25 MKII is a true mass premium product
• Improved audio quality compared to the SR25
• Versatile connectivity, with addition of 4.4mm balanced output support
• Energy-efficient design resulting in 20 hours of continuous playback
• Supports two-way Bluetooth and high-definition codecs (Qualcomm® aptX™ HD, LDAC)
• ReplayGain automatically maintains constant volume

Specification

• General Specifications
  • Model 

    SR25 MKII

  • Body Color 

    Mercury D. Sliver

  • Body Material 

    Aluminum

  • Display 

    3.6inch HD (720 x 1,280) TFT LCD

  • Supported Audio Formats 

    WAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, DSF, MQA

  • 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 2Vrms / Balanced 4Vrms (Condition No Load)

  • CPU 

    Quad-Core

  • DAC 

    Cirrus Logic CS43198 x2 (Dual DAC)

  • Decoding 

    Support up to 32bit / 384kHz Bit-to-Bit Playback

  • Input 

    USB Type-C input (for charging PC & MAC)

  • Outputs 

    Unbalanced Out (3.5mm), Balanced Out (2.5mm, only 4-pole supported | 4.4mm, only 5-pole supported)

  • Wi-Fi 

    802.11 b/g/n (2.4GHz)

  • Bluetooth 

    V4.2 (A2DP, AVRCP, Qualcomm®aptXTM HD, LDAC)

  • Dimensions 

    2.5 ”(63.5 mm) [W] x 4.26 ”(108.3 mm) [H] x 0.63 ”(16.1 mm) [D]

  • Weight 

    about 6.27 oz (about 178 g)

  • Feature Enhancements 

    Firmware upgrades supported (OTA)

  • Operating Temperature 

    0℃ ~ + 40℃ (32℉~ 104℉)

• Audio Performance
  • 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 / 124dB @ 1kHz, Balanced

  • Crosstalk 

    -138dB @ 1kHz, Unbalanced / -144dB @ 1kHz, Balanced

  • THD+N 

    0.0006% @ 1kHz, Unbalanced / 0.0005% @ 1kHz, Balanced

  • IMD SMPTE 

    0.0004% 800Hz 10kHz(4:1) Unbalanced / 0.0003% 800Hz 10kHz(4:1) Balanced

  • Output Impedance 

    Unbalanced Out 3.5mm (1.2ohm) / Balanced out 2.5mm (1.8ohm), 4.4.mm (1.7ohm)

• Clock Source
  • Clock Jitter 

    25ps(Typ)

  • Reference Clock Jitter 

    70ps

• Battery
  • Capacity 

    3,150mAh 3.7V Li-Polymer Battery

  • Continuous Playback Time 

    about 20hours (Standard : FLAC, 16bit, 44.1kHz, Unbalanced, Vol.50, EQ Off, LCD Off)

  • Charge Time 

    about 2.5hours (5V 2A General Charging)

• Memory
  • Built-in Memory 

    64GB [NAND]

  • External Memory 

    microSD (Max. 1TB) x1

• OS
  • Supported OS 

    Windows 8,10 (32/64bit), MAC OS X 10.7 and up

• Etc.
  •  

    - Audio was NOT muted during the measurement.
    - The image/specification may be changed without notice to improve product performance and quality.