ok my question is i am going to buy a suv hopefully a 1994 jeep grand sport... for a just a spl sound toy.. i was wondering i want to hit at least the high 150 or the low 160 or higher i am going to take at the back set and i am going to put dynomat to up the spl to.. i was wondering if i would get more spl from 4 15" rockford fosgate hx2 or 6 12" he2 i don't want to spend more then $650 on the subs on ebay including shipping.. i am running 2 jbl bp1200.1 amps for the subs and a jbl 80.4 to the comp set up front..... i want to show people that u don;t have to spend $3000 to throw high db..... also how big do u think the enclosures need to be for the subs to get the best spl....i want something that will shake cars blocks away... and people down the road to turn there heads before they even see me.. also should i go with ported or sloted.......