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Message: <blockquote data-quote="hispls" data-source="post: 8602532" data-attributes="member: 614752">Often times factory HU is the weak link.  They're basically built just well enough to have inaudible noise with the 8W or whatever they produce, once you start doubling that a few times with aftermarket amps what was inaudible becomes irritating.Perhaps better power and ground to the HU will help, and perhaps even swapping amps will help.  I've had swapping amps kill noise before and not due to defective amp, just the amp is somehow more sensitive to whatever the actual culprit is.Guess and test at this point, you're on the right track in your troubleshooting and IMO haven't isolated any problem yet.  My money is on the limitations of your factory HU.</blockquote>

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