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try running another earth cable from the battery to the car body. and maybe from the altenator to the car body? this will give you a better earth allround. Or you could remove the noise with a ground loop isolator.
im only running one earth cable for 2 amps, reckon thats the problem ? also the kdc (kenwood amp ) has another one. it has 2 earth points ? confused as. its banging tho !! ha ha