scluer.......Thanks for the update. The Denon AVR-4810CI sounds like a processing powerhouse.
It is interesting that you mentioned extrapolated channels, since that is the way a large number of the 7.1 channel sound tracks have been created from the original 5.1 channels sound tracks. I find it interesting to ponder about how many more channels of signal processing, amplifiers, speakers, and subwoofers manufacturers hope to get the geneal public to buy.
My 5.1 channel HT system provides a completely convincing, thoroughly envolving experience. I will probably be the last one to ever add two, three, or four more channels, plus additional subs to my home theater. 5.1 channels does it just fine for me.
I am waiting on the industry to develop the brain chip implant that will allow a person to wirelesly download a movie that puts you directly into the action, with visual and auditory experiences on par with the wildest dream you've ever experienced. You won't be watching anything, you will live it, being completely and utterly immersed, body and mind. When the flick is over you will be returned to your normal self, sitting in your favorite recliner, until you are ready for the next download experience. No screen, no amps, no speakers, no subwoofers, and no wires will be required. The McChip implant will do it all in the neurons of the brain, powering itself totally from body heat. The ultimate home theater will not be in your room, it will be in your mind.