@adafruit There was a video that clearly demonstrated how to #resist the effects of an (admittedly, home made) #LRAD on YouTube.

The Summary is: In-canal Earplugs, Passive over-the-ear earmuffs, and a curved plexiglass shield -- and if I remember correctly, the inside of the curve facing the LRAD (the opposite orientation of a standard riot shield) was the best way to reflect and diffuse the sound, making it possible to approach within just a few feet of the unit.

EDIT: Found it! https://youtu.be/CXKTBQBugIA?t=762