1990 suburban sub box?

I have a 1990 suburban, trying to get a feel on ppls thoughts on what type of box i should build, im taking out the last row of seats so my space is around 4ft long wise by 4ft wide ...i was thinking a sealed box with 3 subs, anyones thoughts would be nice, i been out the car audio game for a awhile now, just trying to get a nice "window Shatterin" bass response type system lol. Johnie

WOW, suburban with no back row, if you want window shattering, just load that up with subs. you could probably fit 8 12s in there still having full visibility out of the back of that. 99 Blazer LT.   Yellow Top. Big 3. Infinity Kappa Speakers All Around. Jensen CD/DVD flip out. 2 Infinity Kappa Perfect 12DVQs powered by a Alpine PDX600.1 (in one custom box, building a FG box)

If you want it loud, then you need to build a ported box. A band pass can get loud too, but it's hard to build, and imo does not sound very good.Big Dave