i was gonna get 2 15 inch jl audio subs and then i was gonna get 2 6,8, or 10 inch subs and i was gonna put them in teh back seats by where ur legs go but behind them so they r like right enxt to ur legs one on each side can i do this?
If you put 2 15's in the back, First you will have to get a custom box made to fit and second you don't wanna put ten's or 8's in cause they hit completely different db level's and different frequency levels no matter how you make the box sizes. I think you would be unhappy with it. Go with the 6's or midrange speakers if its possible to do.
If you're talking about the place that I think you are, then the subs would be outside the car altogether. The place behind your legs in the back seat is UNDER the car. Not impossible, but certainly not easy.