SR25 MKII is the new improved 2022 version. Astell & Kern added a 4.4mm balanced output, perfect for many new headphones & earphones., the improved the sound quality and improved the wireless music transfer functionality - with BT Sink (bluetooth) and Wireless File Transfer (wifi).
SR25 MKII has 64gb of storage built in and a micro sd slot so you can add your own storage. You can also add a variety of music streaming apps via a 3rd party open app service. You can store music for offline playback via Tidal and Spotify and the SR25 MKII is MQA certified, perfect for Tidal Masters music. V-link app built in, which is a youtube app, giving you access to the massive youtube library of live and indie performances.
The SR25 provides impressive sound quality, high end earphones are brought to life and many full size headphones are very well powered with the SR25 MKII. The 2.5 or 4.4mm balanced outputs offer higher output and better stereo separation. The 150 volume notches makes it easy to find the perfect volume, with super sensitive earphones or hard to drive cans.