Earth is hollow, but what if it is also Flat?

Thanks for the science lesson; I knew there was something causing the resonance (and I am in Neo’s camp on this one), but not the physics of it.
FWIW, I have seen articles claiming that people who persistently ride with the windows down (to the point of creating the hum) can injure their hearing.

no wonder I hate that noise.

I’m going with The Government behind Door One, personally.

Indeed, the local weather near the Niagara Falls has changed so much that the ice and snow pattern has shifted.

Naturally any sound pattern involved will be at a very low ( and long ) frequency.

The same effect is used with the basic mouth whistle, a vortex chamber being at the heart of its function.

Those not there at the right time and at the right spots think that the witnesses are dreaming, of course.

Low frequencies also travel farther. This provides a visual disconnect from the true source of the ultra-low sound, which, in this case, is most likely to be cold air shooting down through the Detroit River.

The air trapped in the otherwise sealed auto cabin acts like a gas spring, and the air oscillating through the cracked window acts like a gas mass. So a mass connected to a spring has a strong characteristic resonant frequency. Moving the cracked window slightly changes the freq. Opening a window on the opposite side on the cabin makes the cabin too leaky to have a good resonance.

This could be exactly what is happening with Windsor or Taos if there is some natural structure with a very large cavity connected to a wind blown surface via an opening.
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There is a small scientific field of infrasonics, usually 10 Hz or less, with outdoor microphones that can detect the sound of nuclear testing, meteors, and the like. In some cases they can detect sound waves making multiple passes circling around the globe.

Our nuclear ballistic missile submarines used to communicate via ELF radio waves transmitted from a 100 mile long antenna buried in Wisconsin. That’s been abandoned, and I don’t know what replaced it; but these low frequency acoustic waves can travel immense distances. If our governments were doing this for some military reason, they’re not going to tell us about it.