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Sounds like your did all your homework for this one, so leaves me to believe it's either a bad amp? Or if you are using your oem head unit with a line converter (line to RCA), those are really pretty common to cause noise!
Rule of thumb always start by replacing your stock head unit first. Then upgrade from there. Even if you just go with a $200.00 Kenwood HU with RCA outputs your going to have a much better sound. Even from stock speakers. This is because the HU is the brains of your system!
Just my 2 cents.
Good luck!
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