Interesting concept, beamforming sound to the ear.
https://www.youtube.com/watch?v=Pf3QePhKqg8
https://www.youtube.com/watch?v=2wyTKlfvsok
https://www.youtube.com/watch?v=_gA0trYAL4A

I wonder if over time the ultra sonic frequencies long term exposure will degrade the ear drum at all.

Another way to do this without ultra sonics is to just use a hyperbolic dish …