Those flexible silicone earplugs from Mack's...available often at drug stores like CVS...work very well.

Foam earplugs do next to NOTHING.

They have to seal tightly.


Some still FEEL the vibration...I'm pretty certain it is ElectroMagnetic in nature, but barely intrudes upon the audible portion of our natural hearing spectrum.


I haven't tried to isolate it and measure the fundamental frequency and harmonics...but I'm most certain it is man-made. There may be natural things which exacerbate it cyclically, I haven't tied it to the Moon Cycle yet.

Thanks for that tip!


Cheers



Geez...I just got out my pack, and Mack's is a MICHIGAN company...I had no idea.

www.macksearplugs.com from McKeon Products, Warren, MI

Maybe twenty-five minutes north of where I sit typing this...wasn't expecting that!