I had a thread last week about my alternator noise, many people posted with suggestions about to do and ive tried literally everything. Moving grounds, grounding rca's at the headunit, i even spent 30$ on knu shielded rca cables nothing worked. I went as far as buying a new headunit and that didnt help. Its gotten to the point where im figuring it has to be the amp, there are 2 rma's on the back of my aq 4x90 so its had trouble before, i have been battling with this noise for almost 2 weeks and it is insanely frustrating i cant use my new equipment. EDIT: i havet yet to ground the rca's on the new head unit but i really doubt its going to help it wil get done though