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Sound is derived from vibrations which in turn are generated or represented by changing current levels. Sound can never be derived from a static voltage or current. Your statement that "DC should never produce audio" is - to all intents - true. A ground loop is the unexpected flow of current in a circuit caused by a potential difference between two points ...


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Out of personal experience (I work 9 years as a system technician) I would say "you won't have a problem". If you look at it from a "more scientific" point of view the way buzzes (and in general interference) bleeds into cables is, most of the time, through (electro)magnetic induction (for more information if you are unfamiliar with the phenomenon look for "...


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