[Astell&Kern] A&norma SR25 MKII

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, the SR25, 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.

Body Color : Mercury D. Sliver
Body Material : Aluminum
Display : 3.6 inch 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 | 4.4m, 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℉)

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