I am also interested in continuing to use my 861 v4 with analog amplifier and speakers. Right now I am using a Clux but eventually I will get a HD621. Is the main upgrade the ability to connect the HD621 directly to the 861? The alternative would be to sell my 861 and start over as I don't have M digital speakers. Oh well, I will just enjoy what I have for now and see what develops.

861v6, DSP3100 x3, D1500, Revivers, DSP33 x 5