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.




How many of the GIK 6A Alpha diffusor/absorbers did you use?

I haven’t heard back from GIK yet, but Stillpoint’s says behind the listener treatment is not really necessary.


BTW, the cd rack has many spots where there are few/none cd’s which creates alot of voids etc., in a random manner.


@ozzy Give GIK a few days. Their recommendation for my room was pretty accurate. 

People often seek to apply a solution when they don't know what the problem is. Diffusion and absorption each help resolve different issues applying the wrong one makes them worse. 

Got a reply from GIK. I need more info.

"OK, yeah that's a fair amount of space to work with. It will really come down to tolerance of thick panels and of course budget. If you can fill the entire wall with sound blocks that will work very well but that's a bit of a space commitment. 

If not getting Alpha 6As for that wall will help quite a bit still, and take up less space. 

We can also mix things up a bit, using Range Limited bass traps low near the floor and high near the ceiling, with the Diffusors (Alphas or others) in the middle at ear level."