Dark Grey convuluted foam

I'm still experimenting with the Auralex. Instead of glueing the foam directly to the wall I bought some 2X4 foot acoustic ceiling tiles from Home Depot and glued the foam to the tiles. Easy to mount the tile to the wall and I can move them around until they are placed correctly.
For bass tuning I cut the tile down the middle and mounted four foam pieces to it. This piece goes nicely into the corner.
Man k.d. lang sounds good right now.

What a coincident, I purchased a foam "kit" from Auralex today with the intention of treating a small room which I'm dedicating to audio. Haven't applied it yet as I'm figuring out the best placement. Also have a couple of absorptive panels. We'll see how it goes.

I moved my system into a new room that has two chairs and the stereo now. It was extremely lively with almost no soundstage, depth or focus. After installing most of the foam the improvement is not subtle. The music is no longer seeming to come out of the speakers. I can play it much louder without being driven from the room. I'll go on record as saying this stuff is good for the money.
The previous room was treated mostly with DIY absorptive panels and heavy carpets on the walls. They worked pretty well also. Other than the aesthetics, the room looks like a sound room, the Auralex products work as advertised.

Check Guitarcenter.com for pricing. I believe shipping is free if an item is more than $100. There may be a local Guitar Center near you. I never heard of them until I checked into the Auralex products. They had the kits in stock. My "Roominator" kit was $139 (I think). I have quite a few pieces left over but unfortunately I glued most of them to the acoustic tile. I figured I'd use them all but they can really deaden a room. Now I have leftovers.

check this out http://www.guitarcenter.com/shop/navigation?q=auralex&x=0&y=0