From my understanding too damage the hearing, the sound would have to resonate part of the ear enough to cause damage and if any part resinated, we would hear i

From my understanding too damage the hearing, the sound would have to resonate part of the ear enough to cause damage and if any part resinated, we would hear it. You may get cases in which two inaudible frequencies could produce a harmonic that we could hear, though unsure of any examples in this instance. You may well find though that some frequencies, which not audible by the human ear, may have some effect upon another part of the body. Though I do hope we don't end up having to carry bats in canary cages everytime we go down to the shops. But another way to look at this is - if there was some way sound could be used to harm somebody in any way, then it would have been weaponized. With that in mind - https://en.wikipedia.org/wiki/Sonic_weapon https://en.wikipedia.org/wiki/Sonic_weapon