[I have the KDC 515S and it is routed through the Ford amp ... it works just fine .. my suggestion is to replace the speakers .. there is a weak link for you.
Get this, I wanted to buy a new amp and replace the Ford one and it was all set to go until the tech got inside my car and said" You got one of the few JBL amps I have come across in a Ford, if it were my car, I wouldn't swap it out"
Why would they not want to sell me an amp...???? jj
