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I have one as well, and I've noticed that area proximity detectors (in hallways used to detect presence/motion) do get picked up and come through as loud pops.

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There are also electricity poles with a strong EM field that cause a humming sound.

How loud? These are audible to me without an implant (unless some are audible and some are inaudible)

You might be hearing a relay, which is itself switched by the proximity sensor.

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