Is there any way to hook up car subs with a box to where the stock sub plugs in at? on one of these? mini system

 

Figure out the impedence of the sub, and make sure that the one your hooking up is not lower. I actually ran a pair of lighning audios in my room for a while

 

Most car subs are 4 ohms where home speakers are 8 ohms. If you hook up the 4 ohm subs in series it will give you 8 ohms for one load. What you would do is hook the - of one speaker to the + of the other. Then hook the stereo speaker wires to the remaining leads on the box.