Yes.

Since they are ultrasound waves, they are inaudible for humans, but they may be audible for various animals and for ultrasound detecting devices.

Yeah, the whole concept sounds to me like "let's fire a lot of high energy beams into a crowd, it will be fine".

I’m firmly convinced that a lot of the acoustic tricks that AirPods Pro do to achieve noise canceling involve ultrasonic harmonics, perhaps unintentionally - and this has created an epidemic of tinnitus among their users.

Big accusations require strong evidence. Please provide them, if you have them.

I'm not an expert. 99% of my “knowledge” about ultrasound is from the posted article. Your thought process around AirPods makes no sense to me.

I would be very surprised if active noise-canceling systems would produce sounds higher than 20KHz.

> and this has created an epidemic of tinnitus among their users

Excuse me, are there sources I can read more about this?

If there aren’t, please don’t spread the rumor. You might accidentally trick people into thinking it’s true.

Big claims require big evidence, and so far, this has none.

That’s exactly why I was asking for sources.