M5 would probably be better altogether.
The M3 more cost effective.
Here on the forum, some one had the chance to experience. An ATMOS system with all large speakers. Think it was 8inch ceilings, and sides all around. At an audio show. Remember they highly recommended. Enough low end all around.
I use my old M22 as front height in 5.2.2 config. They do a whole lot when playing DTSX. It's wonderful huge sound even on music. Can seem like watching a concert Blue ray with good C.D.s. The low end from the larger driver in the M5 with 7.2.2. Would totally be the cats meow of emersion.
