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ground loop? emi?

  1. New amp install - bad noise

    9-3 Sedan, Cabrio '04+, Combi, 9-3X Workshop
    In the 93 convertible 2004 the amp is next to passenger seat. Ive tapped into door and rear speakers to two amps and there is huming crackling and whining noise in the speakers when the new amps are on. I have a 4awg power wire running close to this going to fused dist block. I have tried...
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