I have used a 7.2 set up.. .
I used lab 5s up front with a 7-2 center. .. BL3s as surround and 6ks as rears .
the rears get less sound than any . .
Honestly most movies/media don't support 7 channel audio so the BS3 "makes up"
the difference. . You get some sound from them but not much. .
I have gone back to 5.2 with all ALT speakers now.
Hope this helps.
MJM
I'm ready for something new that I actually want to buy!