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You don't want a low power amplifier almost clipping when there are inaudible infrasonic rumbling "sounds" from traffic and aircraft.Aside from the fact that it's not audible, what's wrong with having a lower than needed response frequency just the risk of feedback?
I used electret mics that were overloaded by the small air current when you walked by it. Wind will overload an electret mic.I doubt the tiny microphone can detect infra-sound.
What are you talking about?How long has this war between the USA and OZ been going on?.........