I'm going to be pulling my factory amp this weekend. i'll look and see if there are any adjustments to be made on it. I really don't think there are. I'm starting to think it's a bad factory amp. Now you have a decision to make, replace it with OEM or go after market. I'm told the Alpine PDX amps fit in the factory location so you can go that route and really get a good sound out of the system, probably want to replace all the speakers tho. Good luck!

Cory