When I bought the truck, the previous owner had installed a new head unit, amp and subs. I've never been one for lots of bass (country music listener), but it's kind of grown on me (it's nice to out blare some punk kids when they pull up next to me :lol. However, I noticed that the speakers in the rear doors do not work. I checked to make sure that they were wired into the back of the head unit, and as far as I can tell, they are. The speakers in the way back work. I have no idea when it comes to audio stuff, do I need crossovers, another amp, etc. to get those speakers working? Or is it more likely that the wiring is FUBAR?