I previously had 4 pieces of RPG omnifussors at the rear wall. Shifted them to the front wall and placed CD racks at the rear wall. In other words, I had diffusion at both front and rear walls. I find this configuration to be better than having diffusion at front and absorption at the back behind the listening position. The sound is spread out more uniformly without losing energy especially in the high frequencies. I already have absorption at both side walls. Too much absorption kills the high frequencies, dynamics and soundstage. Used moderately will yield excellent results.
Diffuse Front Wall? Absorb rear wall?
I'll research existing threads, but quick basic question --- is it a basic tenet that I should use a diffusing approach for the front wall and an absorption for the rear wall behind my listening position? I bought a wall rug, put it on the front wall, and though it seemed to quiet the room down in some good ways, it seems to have sucked some of the energy and sparkle from the soundstage. thanks.