I was considering purchasing Axiom QS4 quadrapolar speakers for use in my 11' by 13' HT room. Here are my questions... 1. How far from the back wall should these speakers be? Will I get proper sound diffusion/reflection if they are only 3 or 4 feet forward of the back wall? 2. Will said 3 or 4 feet give me enough room directly behind me for the sixth channel placement? BTW: The room is a 11' by 13' rectangle without windows and a ceiling of 7.5feet. I was going to use direct-radiating speakers as a 5.1 system, but decided to ask about the possibility of the Axiom surrounds before I bought any (surround duty speakers).