Decided to give Atmos, Auro3d and Atmos a try. Last week I spent some time in the attic installing cables for Rear height speakers. I already had Front heights. (Yamaha presence) Just purchased a Denon AVR X4500h to replace my Yamaha RXA 800 from 2010 which still works great. The addition of the rear heights added a nice dimension to Dolby upmixed 2 channel and 5 channel sound. The Yamaha could only process 7 channels. (you could use either front or rear heights) Looking forward to checking out the 9 channel sound with the new receiver. The receiver can process 11 channels but I doubt I will go that far.