Installed a new head unit and now it sounds like garbage

ssteve
10+ year member

Junior 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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ssteve

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