I have Sophia 1's in a 14'W X 23'L with a ceiling that starts at 9.5' on the left side and rises to 10.5' on the right. My system and a 52" LCD screen are between the speakers.
I have tried acoustic egg crate foam, thick gathered material similar to drapes and a thick flat blanket covering the screen. The foam and gathered material tamed the "beast" but the cost was a reduction in imaging and compression of the sound stage.
The flat double thick blanket worked best and with a small pillow on the wall directly behind the system at ear level listening for hours isn't fatiguing albeit's not at 85db!!!
It seems tuning the back wall is a bigger deal in my system/room then the side wall reflections!!!
I have tried acoustic egg crate foam, thick gathered material similar to drapes and a thick flat blanket covering the screen. The foam and gathered material tamed the "beast" but the cost was a reduction in imaging and compression of the sound stage.
The flat double thick blanket worked best and with a small pillow on the wall directly behind the system at ear level listening for hours isn't fatiguing albeit's not at 85db!!!
It seems tuning the back wall is a bigger deal in my system/room then the side wall reflections!!!