20 - 20,000 hz Audio Spectrum Test. Only a Rare Few can hear above 18,000hz. Take it to find out if you're one of them. Title: Most Humans Cannot Hear This Sound. Can You? Take the Human Audio ...

Humans can observe what and where something happens around them with their hearing, as long as sound frequencies lie between 20 Hz and 20 000 Hz. Researchers have now developed a new audio technique ...