Acoustic foam/room treatments - help/opinions sought (N. Abstentia?)

[Sir Terrence the Terrible]

Don't forget about the back wall also, although it should really be diffused and not absorbed so don't go overboard on the back. You don't want it TOO dead.

Actually, if you diffuse the backwall at ear level and below, you will hender imaging coming from the front of the room. Diffusion should not be at ear level, it should be above the head. The lower half of the wall should be dead to keep imaging tight. All of this is room dependent, and taste dependent. A dead backwall will also somewhat dampen the front to rear room mode at higher frequencies.