Many years ago, our local folk DJ, Mary Cliff, told me she carried a NAGRA portable recorder, and that she could hear frequencies (she named a number) way above anything I could.
   I have some hearing loss from working in noisy places... I can hear a car door close down the block, but have to be close to hear my microwave ding.
I am testing hearing aids right now, and can barely remember being able to pick up such sounds.... but I still can't choose between MP3 and WAV or FLAC.... but I can hear any of them much better with the volume turned down!