[themoose8]

Here's a recent build by a hobbyist. An interesting watch and an impressive outcome, it vibrates the entire house.

https://youtu.be/NZKCxIuJ-5M?si=C545ivmg8TvhKhYg

[frankus]

I feel like this is a lot more approachable with the advent of cheap mass-produced RC helicopter parts (modulating the collective pitch with the audio waveform).

(Which has me wondering if you could do some fun directional things with the sound? Of course low bass is not exactly known for its directionality)

[JKCalhoun]

Yeah, physics, as I understand it. When the wavelength is greater than the distance between your ears directionality is lost.