I'm looking into possibilities of changing out the factory speakers w/o infinity system in my truck. The front speakers I have been able to see that they are easily replaceable but quickly analyzing the rear back panel speakers, I do not see specifically how to change out these speakers myself. Since I would be purchasing speakers, even if I bought from a local place I would have to pay installation fee so I figured if I could figure it out I would do it myself. This is a future plan of changing these speakers and would like to know how to do it considering I noticed one of them in the back are busted. All of them are still factory speakers and my new sony head unit can over power them. Any suggestions would be beneficial.