Dark Grey convuluted foam

Ozz, my VMPS speakers have Di-Pole mid range and tweeter and that material comes with speakers in a saw tooth pattern to place behind the mids, maybe Brain C. at VMPS can give you his source.

Fire hazards??? That's why some clubs have had massive fires. Only certain foam will pass code. Most foam burns like mad. Spend real money on the certified stuff.

Thanks for the responses.
The stuff from Foam by mail looks like the stuff I was thinking of.
I dont know if I need it as much as I thought it would look cool behind my speakers.
I also thought the idea was to have a dead end behind the speakers and a live end behind the listener.
Anyway, now I am confused,by some of the comments, if putting this stuff on the wall behind the speakers will deadin the dynamics.

I am no expert but have gone through quite a few trial and errors. It depends on what you're looking for and every room is diferent. If you feel the highs are piercing or the sound becomes 'messy' when you crank up the volume too high then you would need absorption on at least one wall. I personally ended up with absorption at two side walls and RPG diffusors at the rear. I cannot treat the front wall as I have a screen there but have tried diffusors with positive results.

If you do not plan to have treatments on the side wall then I would think you can have absorption at the back and possibly minimal absorption at the front behind the speakers. You need to try it out yourself.

On a separate matter, I find bass traps to have a positive effect in my room as well although some may not find them doing any good in controlling the bass.

You can be amazed at how well your system will perform or react in a well-treated room. Prior to treating my room I always cannot turn up the volume too high although I like my music loud or I would end up with painful ears. Now I often listen at higher volume levels without hurting my ears. It just feels great when you can just keep turning up the volume without getting a 'messed-up' sound. At that point of time you would appreciate the importance of room acoustics and maybe spend more time working on improving it.

Ryder, Thanks for the response.
I do not have a problem with high frequency at all.
I was thinking of soundstage depth.
With my Big Sony in between the speakers, I am sure that limits my options.
Covering the TV while listening to music is ok, but, I also watch Sports while listening to music.

I am using ASC 16" Round Bass Traps in the Corners and on the side walls I have ASC products on the first and second reflection points.
Behind my Sony LCD is a half moon ASC trap and above it is an Echo Buster on the wall.

I was seriously thinking of treating the entire wall behind the speakers to create a dead zone .
I have read that that is desirous along with the area behind the listener as a active zone.
So, behind me is my thousands of CD's on racks providing reflection surfaces.