interference! help

[viperrgh2 10+ year member]

I just finished putting my system in my 93 town car (look at sig) right now I have both amps grounded to a factory ground spot in the trunk, the power wire is running on the opposite side of the car from the rca cables and I'm getting alot of interference. I'm guessing its the ground but I'm wondering what would be a good ground in this car? seat belt bolts? or could the interference be coming from something else?

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