I think axiom reccomends about 4" between the qs8 drivers and the ceiling. I think you could get by with a little less. I agree the qs8's for sides and the m3's or qs 8's for back surround duty would be fine. Either way, I would try to go with 1set of qs8's since they truly are a great surround speaker

Last edited by terzaghi; 01/17/10 02:43 PM.
-David