Installed a new head unit and now it sounds like garbage

[ssteve 10+ year member]

Installed a new Double din in my 03 with Bose and now it sounds like garbage. Used the required gmos-04 required harness and everything works fine. It just sounds horrible in comparison to the stock deck. I have the little box turned down so the door chimes aren't loud, could that be it?

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[IonRL205 10+ year member]

What vehicle and what deck did you put in?

 

[ssteve 10+ year member]

03 silverado with factory Bose, and installed a pioneer appradio 3

 

[Side Show 10+ year member]

what little box are you talking about?

 

[ssteve 10+ year member]

The box on the gmos harness that controls the door chime volume.