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1

Thing is, that if two points in a circuit are actually "ground" (i.e. 0V potential) then by definition, no current can flow between these two points. When current does flow between two arbitrary points on a circuit (that we may consider to be 'ground') this actually means that one or another of these points is actually not ground. Only one of them is. ...


-2

Short a 9V battery across a speaker's input tabs and watch what happens. The cone will immediately move out (or in) and stay there until you remove the battery. But don't let it run for more than a couple of seconds. If you reverse the connection, it will instead move in (or out). (You might hear a brief click when the connection is made or broken, but ...


2

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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