best sounding spl enclosure 4 15?

Hey, i need a little help, i want to build an enclosure for high spl numbers, i have a minivan, so room is not an issue, i have 4 15" rockford fosgate T1 and 2 power 1000's. I would perfer a ported enclosure, but what would you recomend??? Sizes? I know that voltage plays a big part in the game, but i want to build up to that stage, so for now i want to play with what i got. Any help would be great, thanks in advance.

I recommend ported but you want to check out the subwoofer box calculator on this website . But if you going to have all that boom upgrade your charging system or you will regret it later trust me on this one speaking from experenice. Big 3 biger batter high output alternator and 0 guage all the way1993 sdv

Alpine 4x6 6x9 5 1/4 swr-10d4

alpine v60

12.5 VGA flip down

Nettop pc w/10" touch screen

78nova

5-re audio 5x7 ,10" sub &

Xtx-500.5

"Take the faceplate off get the jumperpack"