When I was a kid, and I mean pre-teen, I could occasionally hear the ultra sonic alarm in some stores. This huge ringing that I could comb-filter away sometimes by turning my head. This tells me hi-freqency / short wavelength.
By the time I was 20, I couldn't hear 'em to save my life.
I guess things haven't gotten any better.
Maybe, I'll take out one of those frequency stepped test discs and see where the upper limit is today. But do I want to know?
By the time I was 20, I couldn't hear 'em to save my life.
I guess things haven't gotten any better.
Maybe, I'll take out one of those frequency stepped test discs and see where the upper limit is today. But do I want to know?