Lets say I have some home theater speakers with 2 14" subs in them would it be possible to put them in a box and hook them up to my car?
If I'm imagining what your talking about correctly. These two subs should already be in a box. You can actually just hook it up to your car. You just have to get the right plugs and stuff but it'll work. A buddy of mine in high school had a computer sub hooked in his back seat.
its not that simple at all. sorry. youll need a good amount of watts coming from new amps along with wiring. and probably a new head unit unless youve working on stereos before and can splice the harness. if u want bass id look into audio systems for cars. its way easier. i used to be in your situation but then realized its more complicated. hope it helps man.