Im planning on putting 4 mj 18's in the back of my dodge caravan, . im not looking for big numbers i just want some kick you the nuts kind of bass... the question is if i fire the subs down with maybe 3-6 inches of clearance from the floor of the van how bad would it be? also if i were to do that any suggestions on what way i should be facing the port? i want to fire them down so they are A) more hidden ( i live in a REALLY bad area) and B) i still need to use the back of the van... any help or input i would be greatful for