The bass will be more pronounced(7" behind is more than I have) and the side reflections( I have one speaker with 3-4" and the other is more than 12") may become a problem. On the plus side if you are going to get a new avr with an autoEQ like Audyssey, it will take into account the room issues and EQ the system for the best possible sound. I have recently re-run Audyssey with my system and I am very surprised at the difference for the better. The system now sounds much more open and free.


Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70