I just received the audiosource sw-15 sub from amazon.com Dang this sucker is huge!!! Anyway after correct placement I too find this sub to be rather boomy. Can anybody describe in full on how to do the polyfill mod? I have searched these forums and audioreview.com and still can't find how the mod is done in full detail. Also I've read by replacing the 4 wooden legs on the bottom of the sub with 4 spikes can help increase bass response. Any tips, thoughts, or even links would be appreciated. Thanks.