How To Hook Up Amp To Factory Alpine Radio In A 2000 Lincoln Ls With 6 Disc Changer?

Hi. Sometimes an easy resolve is to get an amp that allows option for 4 channel LEFT RIGHT FRONT REAR input signal to come into the amp from the speaker wires of all front and rear speaker wires instead of relying on RCA inputs from the back of the radio, assuming you do not have RCA outputs on your car's factory radio which you'd then just simply plug into the amp. By having an amp that allows the input from speaker wire outputs you can send the signals into the amp and rerun some wire back to the speakers from the 4 channel OUT which most amps have their OUT for speaker wires instead of more RCA outputs, I believe you know what I sayin'.  Hope this may help. This was the only thing I can't think of that sometimes can be a hidden option in Audio wiring. Good luck