In addition to one of the sub recommendations mentioned, I would also highly recommend replacing the front speakers with a descent set and getting a Kicker Key 4 channel unit and run the fronts in Biamp mode. It takes a little wiring but not that difficult. You will need one of the aftermarket harnesses for the F150 to wire it in to the stock head unit and you can keep the rear speakers powered off the stock head unit. I did this along with an 8" sub off the rear sub C pillar plug with and Amp. I think it sounds fantastic. Staging and imaging is excellent and allows removing the center speaker because the kicker key places the stage up front so need for the center speaker.