A different type of speaker/microphone

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PRR

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> No magnets or capacitors.

I don't see any "field" at all (Alnico, polarization). This suggests it must "double", octave-up, the output.

The wee sound in the video does not refute that guess to my ears.

I hope I am mis-reading something.
 
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No fields for the speaker.
"The speaker can emit thermoacoustic sound by the temperature-induced oscillation of the surrounding air."
Don't know about the doubling. It isn't mentioned and it's hard to tell from the graphs. Not much bass response, at least at that size. Might make an interesting tweeter.

The microphone uses the triboelectric effect, so could be said to have an electrostatic field.
 
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