20000hz adults cant hear

It was probably all those concerts you attended when you were in your teens and early 20s. Or all the clubs, with that thumping, thumping, thumping bass. Or maybe it was the hours and hours plugged into your iPod with the volume cranked up, singing along to the bands you listened to back in the day. Hearing loss — sorry to sound old — is real, something that happens even to those who didn't spend large chunks of their 20s in loud bars or trapped underneath the latest headphones or earbuds.
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Most people over 18 can't hear these sounds

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Most people over 18 can't hear these sounds | MNN - Mother Nature Network

The functioning of the inner ear is at least temporarily altered by exposure to low-frequency sounds. A wind turbine, a roaring crowd at a football game, a jet engine running full throttle: Each of these things produces sound waves that are well below the frequencies humans can hear. Listening to just 90 seconds of low-frequency sound can change the way your inner ear works for minutes after the noise ends, a new study shows. Louis, who was not involved in the new work. Humans can generally sense sounds at frequencies between 20 and 20, cycles per second, or hertz Hz —although this range shrinks as a person ages. Prolonged exposure to loud noises within the audible range have long been known to cause hearing loss over time. But establishing the effect of sounds with frequencies under about Hz has been harder.
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High Frequency Range Test (8-22 kHz)

Hearing range describes the range of frequencies that can be heard by humans or other animals, though it can also refer to the range of levels. Sensitivity also varies with frequency, as shown by equal-loudness contours. Routine investigation for hearing loss usually involves an audiogram which shows threshold levels relative to a normal.
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Humans hear frequencies from 20 Hz up to 20, Hz. As we get older, or exposed to loud sounds which damage our ears such as loud concerts , the upper limit decreases. This test helps you benchmark the highest boundary of your system's frequency extension. If you can't hear any of the high frequencies played back during this test, don't blame your speakers too quickly. Unlike low frequencies, high frequencies are easily reproduced through smaller and cheaper speakers.
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