This is a bit out of the way; But I work in a industrial facility. My job at one time was monitoring very large scale systems, used for weighing up large amounts of raw materials in a very short period of time. In order to accomplish this, very powerful vibrators/shakers would come on to start the weighing process.
I'm guessing these shaker systems run off of 440Vac and vibrate, I'm guessing between 40-60 times per second.

It never failed to just amaze me that when I had to walk by that shaker that my whole chest/abdomen would vibrate to that vibration and much more than enough to notice.....it felt kinda nice.

There was definitely a sympathetic resonance event occurring. And though one can speculate about the exact frequency, the Amplitude of that vibration was a major contributor to that physical response.

Though I didn't turn into a mud-puddle, some might argue that my brains got a little mushed up. : )

Anyway, Amplitude should come into play somewhere in order to create a significant sympathetic resonance, I believe.