I got 4 new rockford fosgate speakers. I heard about cutting the basket in the doors. I am fine with that. I am just confused about the extra wires that run to the factory speakers. My speakers came with two wires + and -. I also know that there is the separate amp and the whole acoustic feedback thing in the rear speakers. I want to keep those. All i want is to put in my new speakers. I need help with the wiring!!!! Thanks