Hi,
A line Noise Eliminator is just a Band-Aid and reduces the noise but doesn't eliminate it. It also has an adverse effect on the sound, though undetectable by some.
I suspect the issue is with your Alternator. Either it's not properly grounded, or one of the 3 Diodes is shot. Do a load test on the Alternator to be sure, but I bet this is the source of your problem. Hope this helps...
Happy Motoring!... Jim'99
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