In an old DIY book, it was mentioned that headphones could be used as microphones (this was back when computers had separate jacks for headphones and microphones).
Is the reason why a magnet and a inductor is not used for the same purpose is because it is not that compact or due to the interference ordinary magnets may have on the setup?
Speakers absolutely work as inefficient microphones, and there is no reason that a microphone can't be made using a magnet/inductor combo. In fact I'm sure many of these exist. If I had to guess why electret microphones were more common, I would guess that they are more compact and less prone to mechanical failure, but I'm not actually sure.
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