"When you turn on the diagnostic display in the Mconfig,
you can look for the audio stream.
When you play a CD, you can see on the display if the HD621 make the apodizing upsample or the 861V6."

Robert
Not sure what you mean by this. If you mean turning upsampling on in the HD621(HY-Yes)-- then yes it was on. The 861 is saying "MHR Music2 96K". I am assuming that means the HD621 is upsampling and apodizing as the v4 said the same thing. I think the difference in sound quality I hear is because of the SL connection between HD621->861v6 but that is total speculation on my part. I need to turn off the upsampling in the HD621 and listen to hear the difference. It sure would be nice if the HD621 had a front display.
Regards
Joe

My gear: Trinnov CI, 271, 8000.1(SEs), 7200.1 HC (SE), 320s, 3200s, Seaton F18 subs, MS200 (2nd zone), 218, 210.
Other: JVC RS-4100 projector, Lumagen Pro Radiance, Panamorph DCR anamorphic lens, Stewart G4 130 screen, Kaleidescape Strato K, Rvolution 4K player and Zapitti NAS, Oppo BDP-203,Roon Nucleus