From the article:

https://news.mit.edu/2022/low-power-thin-loudspeaker-0426

"the thin-film loudspeaker could provide active noise cancellation in clamorous environments, such as an airplane cockpit, by generating sound of the same amplitude but opposite phase; the two sounds cancel each other out."

"Because the tiny domes are vibrating, rather than the entire film, the loudspeaker has a high enough resonance frequency that it can be used effectively for ultrasound applications, like imaging"

So, don't sell your subwoofer(s) yet.