Ok, so I actually moved the ground from the amp to a different bolt in the trunk and sanded it real good. Still have a engine buzz noise. Wondering if it is now the deck that needs to be grounded to the body somewhere also. I believe you grounded yours to a bolt near the gear selector? And my Hd 900-5 also seems to have a bit of a hissing noise when I set the input gains to the 24.6(fronts) and 44.7(sub) voltage levels. Maybe I should turn the amp gains down a bit to make the hiss less?
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