Hey guys gotta a question for yah that's out of my area of expertise. I have a 04 extended cab with the Bose system, I have also added subs and amp under the seat about a year ago. Stereo has been working great, Friday afternoon I go to turn it on and only my back speakers are working. With everything off you can hear kind of a very faint squealing noise coming from front speakers. Question is, do I start with a Bose amp or new head unit? Would be a lot easier if there were no factory amp in the mix. Thanks