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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.
stevewetterling
tweaknkeep
38 posts
 
I replaced the Sonex foam I had with 3 diffusers (each 2' x 4') which I put next to one another along the front wall behind the speakers. My speakers are about 5' out from the front wall. The diffusers increase ambiance and I enjoy the change. It also increases strident sounds. I discovered that Cabledyne power cords cut down a lot of the strident sounds. ASC tube traps also help.
meerzistar
232 posts
 
May I ask what fq. range diffuser do you use behind speakers? Currently I have 1 mounted behind each 34 1/2" tall speaker. Diffuser panels are 2x4’ raised 1’ above floor. This design is tested effective in the neighborhood of 3100 hz on up. Does this sound ok (no pun intended)? I'm a little limited with placement being that theres a wall mounted LCD 3' above floor level. 
bdp24's avatar
bdp24
9,500 posts
 
ASC makes a model called the Martix Panel, designed for the wall behind the listening position, if the listener's head is within two feet of that wall. It provides a mix of absorption and diffusion, so as to not make for too dead a sound. Maggie owners use tall Ficus trees behind their speakers as diffusors, and then there are LP racks which are of some benefit at scattering sound.
ptss
1,964 posts
 
Basic answer-yes. Maximum diffusion (phase+time) behind the speakers will allow you to best hear what your speakers produce. I like a combination of diffusion and absorption on the rear wall.
rockadanny
1,222 posts
 
After speaking with one of the well known manufacturers of acoustical products, based on their recommendation, for my new room I will be treating the front corners and first and second side reflections with absorption/traps; and the back wall with a few of their absorption/diffusion combo products. I will then evaluate further to decide if i need anything else. 
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