"MINe 109" wrote in message

In article ,
"Powell" wrote:

CNN had a piece on special ring tones only
teens can hear. Couldn't find link to said. Uses
very high frequencies most adults are unaware
of. Would allow teens to receive calls in the
school class room. I guess only other teens
would find it distracting in doing so.

http://static.orgday.org/orgday/Teen%20Buzz.mp3

I can hear it clearly on the Grados, but not on speakers
in the computer room.

As Robert pointed out, its mainly composed of energy that peaks around 18
KHz. There are a bunch of spurious responses all over the audio band that
are about 110 dB down. They are generally inaudible.

If you play this sort of thing through the *right* crappy audio system, high
frequency intermodulation distortion (common in really cheap audio systems)
will move lots of energy down into the audible range.