If they meant 1000 HZ, this might be more believable.
Harmonics...
Have you ever heard recordings of Tibetan Buddhist monks chanting? Some of them chant at frequencies lower than any note one can hit on a piano.
By the way, does anyone here know of an online acoustic generator that I can access, to hear a tone of 110 hz? I’d like to see what it does.
Drums. Boom.