i have a single cab nissan pickup...

is it possible for someone to build a box for shallow mount speakers where the box is 4" deep? unless i move my seat up one notch, however much that would make, im not sure.

not sure about most the subs with the given mounting depth, but i know the jl tw5 is around 2.54" deep and i know i could use those... i am just not sure how much .8cubic ft is?(sealed box volume given in the stated specs)...i'll welcome any and all feedback, thanks!