hello all. i am gonna buy the sony sa-wm40 sub in a couple days and everyone says to modify it. so i am going to. im just not sure which materials to use. many are saying to use the polyfill. but this one guy says to use foam "egg crate" type sound damping panels, he says that is much better than polyfill. he also says to use mod podge on the front and back of the driver, he says that will make a world of difference. so i need everyones opinion of what is the best thing to do. thanks.