hi gang, my cabinetmaker just finished my 4 pi's and i'm ready to start installing. is there any benefit to using the premium sound dampening materials over good old fiberglass other than the itch factor?p.s. i would still consider 4 pi's to be fairly large speakers, in the same league as the old jbl 112's. here's how i convinced my wife to let me put them in the living room, i brought home the theater 7 pi's first! cheers.