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-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 ...


0

You're going about this the wrong way. You can't fix this in post and make it a usable recording. When you are recording an engine such as this you need to ensure that you test multiple locations for the microphones and pick the locations that give you the sound you need. The solution is in the recording, not in trying to remove half the spectral range with ...


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