CatmanV2
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An AC signal on a speaker? That would just be a buzzing noise surely?
Umm, not really, no. I mean it *might* be, but probably only if it's a square wave. Or possibly a sawtooth or similar. Pure sine wave AC will be a single tone.
Some nice traces here
http://www.planetoftunes.com/sound-audio-theory/types-of-audio-signal.htm
C