Health Nut, As I understand it the upgrade form V2 to V4 is No longer available.

As for processing power; Meridian did not have a crystal ball as to how fast things would have moved on.
Also, just because things with regard to procesing can be done today, does not mean it was possible when your v2 was designed and the design was finalized.

No Company can support economical upgrades forever. Think Microsoft and Windows 95. Its moved on.
Look how cars have changed. Thats Life im afraid.

Good luck with whatever you do finaly replace your 861 with.

Cheers, Chris smile

No 18 in the Hall of fame smile I have simple tastes; I am content to settle for the best:
GIK monster bass panels, rear wall. QNAP TVS 471i3. Roon into DSP5200SE via 210/ 218 zone... Explorer 2. Bluesound Pulse 2, Mini & Flex. 596v1, 518, Foxsat HD, Sony BDP, Pioneer 5090, 2 Chromecast's for LRB videos. MS200 to F80 for a Roon zone