Putting a mic in your ear doesn’t sound very effective.
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LOL... You beat me to it, mlo! I was reading the thread to see if anyone else picked up on that.
It’d be a good way to catch what Joe Biden is saying when he’s “talking” to the women that attend his public appearances.
Ok, I’m going to say something really nerdy:
A speaker and a microphone are the same thing; an electromagnetic transducer. It’s like the two paper cups at each end of a string. The cups can be both a microphone and a speaker.
It would be easy to convert one to the other.