Quote Originally Posted by jeroenliebregts
the test is wrong. only babies are supposed to hear anything above 19 kHZ. I didnt come any further that 14kHZ last time i did a real test...and now i can hear 21.1...

Also these are mp3's...the compression from WAV to mp3 probably causes a so called mirror frequency, which is a lot lower than the actual tone. That's the thing we are all hearing!
Quote Originally Posted by DSP
it goes for 4Hz to 24kHz and it's a wave file, not mp3.

www.patrickdsp.com/audio/4Hz-24kHz.wav