Sound System

Ok, right now I have two containers with 70 lb of sand in each of them. They take up the center of my trunk. I was thinking of building my own boxes and putting two 10" subs (one on either side of the containers. I was wanting to know if it is hard to wire a system on a J30 and if the original speakers will connect to a new head unit for the subs.

i've got a 12" with no problems at all