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RE: Absorption or diffusion for rear wall 2.5ft from listening position

Posted by David Aiken on October 3, 2011 at 13:27:07:

Diffusion takes space in which to develop—sit too close and not only will you not get the full benefit of the diffusor but you may also get some unevenness of sound. How far you need to sit from a diffusor depends on the diffusor design but RPG mention a 10' distance in some documents on their website though they also seem to sell some diffusion products which allow closer distances. I'd say 2.5' is going to be too close for pretty much any diffusor so that means that absorption is your best choice.

With absorption, having some space—say a minimum of 4"—between the absorption material and the wall improves the efficiency of the absorber extending its absorption a little lower in frequency and increasing the amount of absorption.

I'd suggest as a minimum covering an area at least 2' high (4' would probably be better) and extending to either side of your head to about a foot or two past the rear wall first reflection points. Place the absorption at a height that places your ears around the middle of the absorption in the vertical plane.

What kind of improvements can you expect? Depends a lot on your gear, the rest of your room, and what kind of absorption you use on the rear wall and how much of it you use. There's too many variables for me to make a prediction. You don't say whether you have any other treatment in the room but unless there's something specifically related to your rear wall causing problems, treating that area isn't where I would start with room treatment. I'd start with bass trapping in the corners.