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.



It depends how far behind you the wall is; in my space, it is far enough back that reflections have a minimal effect. That is partly because there is a hallway and an open doorway.

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