What do you mean speakers? Give more info. Are you referring to the sub or door speakers. It sounds like a bad install! I would not use a dealer to do an aftermarket stereo upgrade. If it is speakers for the door that are bad, if that is the case, look up and call Gold Star Adio in Irvine California, net search, and speak to Jay. But, firat have a stereo guy look at the install.
Z