Question: Sound Treatment behind the Listener?

I have treated the 1st and 2nd reflection points and I have sound panels between my speakers. I also have tube traps in all 4 corners, but I am not sure what (if any) should be done with the wall behind the listener.

That wall presently has a DIY rack system that holds about 5000-6000 cd’s. I believe it helps scatter the sound. But I’m not sure if that is the right approach.

So, what are you guys using on that wall? Diffusion, Absorbtion, Reflection? Anything else?

I would appreciate your thoughts.



Diffusors high up help also, so if your rack comes to waist-high it's worth putting diffusor panels above.


ozzy's avatar

ozzy OP

6,511 posts


I am sitting about 1/3 from the rear wall, or about 8 feet.


I would recommend diffusers on the back wall, given your room's layout. I use the following in 6" thickness:

There in fact a combination diffuser / absorber / bass traps


You don't wall sound directly behind you bouncing back at your head. Directly behind I use absorption and then to the L and R I use 3D diffusors, maybe try either of these:


Thanks for the help.

The DIY cd rack at the back wall (behind me) starts at about 4 foot high and does go to about a foot from the top of the ceiling. It covers the width of the room. The rack does have many open spaces between the cd's. Again, I thought it would help with "scatter affect." But I’m not sure where I got that idea, and I did need a place for the CD’s.

These days I don’t play CD’s and I thought about taking down the racks. The Gika Acoustics or the T’fusor, looks to be an interesting option. Should they be placed in the center of the rear wall?

BTW, the rear wall is about 17 wide and 8 feet high.


when i designed and built my listening room, i purposefully put a room length storage closet behind the listening position, then mounted heavy duty curtain rods above that area, hanging heavy velvet curtains to help absorb the sound from behind

i think this contributes quite a bit to the room being well damped... as i can open the curtains and hear a difference

this may be worth your giving a try ozzy