has anybody ever heard any info about the qlogic hidden chamber boxes? i heard they are really good and make your subs sound 2 times louder or thump 2 times more then they actually do. im thinking bout getting one and was wondering what people think of em. bestbuy wants like 300 bucks for one but i found them cheap here. http://www.cardomain.com/item/QLCQLH12512DS