7702 unit have Atmos.
7702a unit have Atmos and DTS:x
I do not share your experience with dull sound.
Perhaps not too lucky match with speakers or room(eq) (the room eq downsamples to 48 KHz).
Well, I was wondering maybe I had a defective unit because soundwise it was a disaster. I don´t think it was a matter of a match, I also had an older AV7005 with completely other speakers and it also sounded dull.
I´d really love to have a nice sounding processor with all options and formats for relative small amount of money, at least comparing to Meridian prices. In my case unfortunately I see (hear) no advantages.