My car is standard convertible the sound from the radio leaves a lot to be desired. So would replacing the radio help? I prefer not to tear the doors apart so I am looking to add a speaker on the hooks between the 2 seats on the back panel I would have to run a wire from the radio to the speakers I would want to tap the left door speakers. What color wire goes to the left door and is there a better way to tap that wire. I assume all the radios wires are wrapped in a loop in the car, an ideas?