Ultrasonic use by Middle-Aged men

[Shannon]

Ron, it is true that high frequency hearing diminishes as we age. However, you are in luck, because it diminishes consciously, but my research shows that it does not diminish sufficiently to make ultrasonics ineffective unless you have certain forms of "hard" deafness. Ultrasonics, in fact, may actually be the only kind of subs that can be used by people with some types of full deafness! (I haven't verified this, but I have read about this being posited as the results of other people's experiments.)

Ultrasonics will work for you, even if you cannot consciously hear them, as long as you have otherwise good hearing.