Great read!! Thanks.
Another question. . I worked on one of the Pioneers with that RCA issue. I simply ran a wire from the chassis (HU) to the outer RCA shield and the noise was gone. Now that solely defeated their isolation, yet it cured the problem, so why would they even bother with the isolation in the first place? Would it be specific to the design of the HU itself, or just something manufactures do?
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