ABSTRACT
Typically stated as being from 20 Hz to 20 kHz, these are the acoustic signals that normal humans supposedly can be said to “hear” reasonably well. In older individuals, the low end may still be 20 Hz, or even a bit lower, but the high end often drops to 15 kHz, 10 kHz, or even lower, depending on both heredity and lifetime environmental factors. The musical significance of signals above about 15 kHz or even sometimes above 12 kHz is debatable.
