I have a 2006 silverado with a 'os to bose' unit interfaced. Everything works fine, except the rear speakers are muffled, they are way to low.
I even replaced the 'pac os to bose, and that is not the problem. I tried every setting, and double checked all the wiring, I even took it to cc, and had one of there installers listen to it ,and he said it did not sound right.
Doe's anyone have an Idea what could be wrong...Thanks