Quote Originally Posted by slick2500 View Post
They might have turned your amp down when they installed the speakers and forgot to turn it back up.
For the humming, give this a try. http://www.grandprixforums.net/feedb...ems-17284.html
I checked the gain on my amp for the subs and it was the same. bass boost level the same. Everything was left i think. All i know is my system sounds horrible now.

Could this be because they didnt bypass the factory amp? Anyone?