bm mk iii

Ok so I got a 05 single cab chevy. Lookin to put either 4 memphis s class or BM MkIII 12s behind the seat, sealed in a 4 (.5ft3) chamber box, or 3-4 SA-8s down the middle of the cab preferably in a ported enclosure, Now ive read and been told center bass looses a few db but with the higher...