Bad wire ground in head unit?

My Kenwood x597 head unit is causing distortion in my 2010 Honda Civic with aftermarket speakers. When the system is running, i get a low buzzing sound that is evident of a bad ground. I've made a very good ground but i still get some distortion. All distortion instantly disappears when I turn on the headlights or brightlights. This makes no sense to me, it seems to be a too much power or bad ground issue.

You may need to get your supressor checked or even get a bigger one this is what stops bad feedback from the alternator. (Sending more power than needed to the head unit) or it could be wireing between the amp and head unit if you are running one. If so you need to separate the rca cables and the power cables running to the amp. Like run one down 1 door trim and the other down the other side.

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