I wish they would create a report on room sizes. for speaker placement and how many.
I have a room 11.5w x 15,5 L and 8 H
just wondering as currently I only have 5.2 with QS8.
However just seems I am missing that rear sound channels.
I am 10.5ft from front speakers and back wall is 4.6 ft
but, I got a rear entry door and it is 2 ft off the side wall.

Anthem MRX520
M5HPv4
VP160HPv4
QS10v4