Google up one (or All) of Dr F Tooles' youtube lectures.
Fascinating listen from the man who established a method to analyize speakers to determine if they sound good.

He maintained that the centre channel is 90% of the perceived sounds.... 5.1.... 7.1 etc.. is mere distraction..irrelevant
Also claims that the room has Small (negligible) effect and only then below 200hz.
But hey! the viewing of all this..is only a few clicks away :-0