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25-Nov-2017 21:32

For men, this can start as early as 25 and women at 30.

On an audiogram, the resulting configuration has a distinctive notch, called a 'noise' notch.

Human hearing extends in frequency from 20-20,000 Hz, and in amplitude from 0 d B to 130 d B or more.

0 d B does not represent absence of sound, but rather the softest sound an average unimpaired human ear can hear; some people can hear down to -5 or even -10 d B. But the ear doesn't hear all frequencies equally well; hearing sensitivity peaks around 3000 Hz.

There are many qualities of human hearing besides frequency range and amplitude that can't easily be measured quantitatively.

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But for many practical purposes, normative hearing is defined by a frequency versus amplitude graph, or audiogram, charting sensitivity thresholds of hearing at defined frequencies.

If one is exposed to loud sound (including music) at high levels or for extended durations (85 d B A or greater), then hearing loss will occur.



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