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i used 2'x3' gray convoluted foam sheets from www.uline.com for soundproofing my garage studio.
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go to http://www.uline.com/Browse_Listing_863.asp
there you can order them. Buy S-6438 24 x 36 x 2" option, because you'll get maximum square footage per dollar. It cost me around $80 for a minimum order of 2'x3' foam sheets. You will get a box with 18 sheets. That's 108 square feet of soundproofing. As compared to Auralex stuff sold at major retailers, you get 96sq.ft. for $279. ofcourse Auralex looks better and you can choose colors, it costs $2.9 per foot, when uline stuff is only $0.74 per foot...
Note that Auralex has sharp cones and regular foam doesnot, i personally don't think sharp edges make a lot of difference, but i can say, when i compare my studio before and after, there is dramatic reduction in echo. I can actually hear my monitors better.
You can glue them to the walls using foam adhesive, or non-toxic glue sold in many home improvement stores. make sure the glue don't dissolve away the foam...
You will love your room after you put those up!
If you are not trying to kill ambient echo in your room, but trying to isolate it, so other people in the house don't hear your boom, studio foam woun't help you much, it doesnot reduce bass frequencies, and your room will sound bassier, because most of highs and mids will be reduced by the foam. This will make your tiny speakers sound like bigger ones. You will need to either build extra walls inside your room and fill them with concrete, or build brick walls around your room in order to contain those lows. But the foam does help a little. contrary to concrete idea, you could research more on "basstraps" i heard those seem to help.
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