Well... No. And opamp output is fully different than an opamp input. They aren't reversible.
The electronics would have to be specially designed to be a transceiver instead of just a speaker output (I mean, they definitely can do it, it just is more work and more cost)
It would be 10x cheaper just to put a microphone in it.
Any device with a speaker can be retasked to use it as a microphone.
Well... No. And opamp output is fully different than an opamp input. They aren't reversible.
The electronics would have to be specially designed to be a transceiver instead of just a speaker output (I mean, they definitely can do it, it just is more work and more cost)
It would be 10x cheaper just to put a microphone in it.
Sort of. Most of them would need a change in hardware to support it.