what can i use?

i don't know much about this but is there some kind of cheap material i could get at like a wal-mart or something that i could put in behind my front speakers on my doors that will direct the sound towards the inside of the car???

i dont know how good theses are but....

http://www.crutchfield.com/cgi-bin/S-Cka9bAcUYU7/ProdView.asp?s=0&c=11&g=762&I=237XT65

i'm not sure about anything you can find at walmart...

i don't think those are it, says they just protect against dirt and moisture..i was wanting something that would direct sound, thxs for your help though man

Dynamat speaker kit... but you wont find it at walmart -- try BestBuy

thxs guys, i know the dynamax is damn expensive, i was just hoping i could get some kind cheap material somewhere else that may do something to affect like the dynamax