How can I make my own acoustic materials?

Try checking out this site. Jon is an electrical engineer and works for a company designing Pro Sound equipment. He is well versed in pretty much every aspect of sound reproduction. Hope this helps... Sean
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http://members.nbci.com/Jon_Risch/index.htm

Yes you can. Here is what you do, Go to Home depot and ask them for Duct Board it comes in 4`x8` sheets which is coated fiberglass insulation and you can cut them anyway you like. Then you can go to a fabric store and pick out what ever material you prefer to cover them. Or you can call a card board facility and ask them for the sheets of cardboard that have the ripples in them and they are 2" thick. The duct board will be a better sound barrier than the card board but they will both help you acheive sonics benifiets. Good Luck P.S: It may be cheaper to just purchase the panels. Also I just remembered that if you go to an acoustical company they may have panel or the foam sound panels left over from a job they can sell you very cheap. I got mine that way. The place is called viber sceince in Branford Connecticut. :-

Be sure to ask Jon Risch about making your own room lenses. They work fantastically well and work best with no other room treatment. They are quite easy to build and Jon has the necessary info.