The back of my m60's are about 8-9" from the wall. Axiom has stated to give at least 3-4" to allow the low freq's to filter into the room. The bass is no emphasized for me, that for sure. It is more important that your drivers are not the same distance from the back and side walls.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85