hi, just trying to clear something up... I don't ever remember saying that mixing in surround for dvd, or dvd-a or using sacd ISN'T capable of higher than cd quality sound. I just about always use 24/96 on those mixes. dvd-a can do 2 channels at 24/192... I personally haven't screwed around with dvd-a all that much though.
As far as the 2 major types of home 5.1 setups... they do exist, and they do sound different. that's not about phase problems or cancellation, it's just about sound... obviously a system with 2 great fronts, a horizontally mounted center of an altogether different build than the fronts, small satellites for surround and say, a passive sub... is going to sound different than a system with an active sub, and 5 speakers that are all identical.
If you think that's off base, and those two kinds of setups sound identical, than we're really just not communicating, and I apologize if I'm not making my point clearly...
as far as phase, I 100% agree with what you're saying with a 360.1 config... since the listener is in fact 'surrounded' by speakers, only the direct sound coming to his ear is important, which lessens his reliance on room sound, and reflected sound from the fronts.
I'm really not sure where I'm not 'updated' it really sounds like we're on the same page on everything except my belief that a setup with different size/strength/quality of speakers will sound different than one with matched speakers.
Hope this helps.