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lot's of young people can hear 19-20KHz. When I was 12 years old (a while ago :-), I could easily hear 30KHz. In fact the FM carrier is 19KHz and when Stereo FM first came in, the FM sets did not filter it out, and I found FM impossible to listen to because of the high pitched whistle. Gosh, maybe you have to start including age as a parameter in TP750 ownership :-)