Tape Trail

RE: Two part question eh?...

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The sound is transmitted through the air once the acoustic waves leave the speakers. That part is obvious. What's not obvious is what the "audio signal" is in wires and cables. Hint: it's not vibration. The same idea applies to the cassette and tape head - it's not an acoustic wave until it leaves the speakers or headphones. Before that the audio signal is a different animal. But what? A voltage, a current, an audio waveform? An electromagnetic wave?

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