The 4hp has alot more motor than the Q. It doesnt need that large of an enclosure. Someone had one in a 7 cube box tuned to 37hz and unloaded the sub and practically destroyed it. He was giving it 3k. Like i said before the enclosure size is just fine, but port area should be around 150 ish
my post wasnt meant to comment on the size of the box just merely the fact that he needs more port IMO
