Do we know all there is to know about electricity?
No, but we know enough to use it to capture and reproduce sound waves.
Is there a possibility that we still have a lot to learn?
Yes, but not about conductivity in copper.
Is there a possibility that we might not know all there is to measure?
Yes, but we can measure sound beyond human hearing.
But you folks know all there is to know, right?
No, but I know an argument from ignorance when I see it.
But you’re beyond that loosely goosey flakey stuff.
I'm beyond thinking magic discs stuck to wire cables would be anything other than a tone control.