Originally Posted by Kage
Haha, my headphones can't even play the 18KHZ ones.
They're naturally getting quieter as a trick?
The first 3 peak at about -1dB. The 4 tones after that peak at pretty much 0dB. The 8th tone peaks at -1dB. The 9th tone @ -4.5dB(less than half the power of the previous!). The 10th tone @ about -14.3dB and the 11th tone @ -33.3dB.
The 12 tone, as proved above, just isn't there.
No one will hear the 11th tone @ -33.3dB down! But through a very, very big audio rig!