D'oh !!

The top is a 90 degree corner. I forgot about that.

I guess I can also load the wall/ceilings up with bass traps (which can also act as absorbent panels) if I have a boom problem...

Thanks !!

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8