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Message: <blockquote data-quote="1aespinoza" data-source="post: 8711389" data-attributes="member: 654802">I have not come accross amp ground that causes noise. The ground that will cause noise is the radio ground. I have seen it happen when messing around with live speakers and the inputs accidentally touching. After this, some radios will start humming in sync with engine revs. It is common in Pioneer radios for some reason. The three solutions I have found are, grounding radio chassis, using only one set of rcas, and fully inserting rcas.   The solutions that have never worked for me are, rerouting rcas, ground loop isolator, grounding rca outer ring, and looming rcas in an iron core.</blockquote>

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