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this post was submitted on 16 Aug 2023
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Wait... Am I missing something here? I don't understand why a 10kHz wave would do anything to a pair of speakers at a distance.
Unless the speakers are actively playing the output of a radio themselves, it's not like 10kHz waves will randomly affect the membrane of an electrostatic speaker. The membrane vibrates by an electric signal, not by EM radiation.
Even then, I feel like radios don't just output whatever their antenna picks up raw. The electronics in radios tune to specific frequency bands and decode the underlying signal by means of FM or AM, and it is that underlying signal that gets played by the speakers.
So even a stronger encoded signal doesn't necessarily mean louder speaker volume. It would just mean a clearer, less-noisy song.
Powerful radio signals will cause interference in anything aerial-like that they pass through. Speaker cables would serve perfectly. For FM signals this would just sound like static or horrible nosie, but AM the interference will sound like a distorted version of the sound signal. Interference in the speaker cables will pass to the speakers... I guess this is the idea, but you'd need a very powerful radio transmitter which would almost certainly be illegal.
I didn't study the article but it sounds like the idea is that the AM amplifier will cause an induced current in the speaker. No idea if that's true or not though
I was afraid that's what it meant. I haven't done Emag calculations since college but I feel like induction would only work at extremely close distances (as in centimeters) if at all, right?
All those induction experiments have multiple loops, tightly around the passing magnet for a reason since changes in the current is directly proportional to changes in the magnetic flux density (and only the ones normal to the surface area created by a closed loop).
And the closed loop created by the speaker and its source is a really irregular shape, designed to have a small cross-sectional area anyway. It all sounds kind of fishy.