Anyone here know materials that can reduce sound?

The delta fan on my system is giving me a headache. Anyone know of a site with pictures showing what material I can use to wrap around my case to reduce that sound? Also is it possible that a store like home depot or wall mart will sell something like that? Thx

have u considerd the 7v mod or even 5v ?

5v is a bit extream and realy bad for cooling but i did it cuase even @ 7v my comp was just geting annoying

i have heard of lineing your whole case with cheap mouse pads to reduce noise