that part actually could be true... sometimes i hear old tv's making really high pitched tones that nobody else seems to be able to hear. i had an old 20" crt tv that was junk, i never used it because i could see the screen flickering and it made a really high pitched noise. my mom said the tv looked fine and didnt hear any noise from it. some people have better vision than other and some have better hearing than others and some have both. but 25khz? no, i dont think so