Has anyone had any experience upgrading the subs on the Sony music system? It comes with a 8" sub but I'm looking to swap that out with something a little better. I replaced all of the OEM speakers and added a amp in my previous 2012 F-150 but never got to the subs. I'm looking to keep everything as is except the sub. I'm thinking something shallow mount from JL Audio unless someone can steer me in a better direction.