Tiny Speaker Busts Past Sound Limits with Ultrasound

Conventional speakers work by moving air around to create sound, but tiny speakers that use ultrasonic frequencies to create pressure and generate sound opens some new doors, especially in terms of maximum achievable volume.

This is a companion discussion topic for the original entry at https://hackaday.com/2023/11/27/tiny-speaker-busts-past-sound-limits-with-ultrasound/