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In Reply to: RE: Well, what IS news . . . posted by Inmate51 on June 09, 2015 at 19:38:38
My understand is that prolonged loud noise does irreversible damage.
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Percussive / impulsive sound is particularly harmful. This is because our hearing mechanism doesn't have time to respond to it, and so passes the sound unhindered to the cochlea. The muscles in the middle ear normally contract/stiffen when presented with a loud sound, to protect the inner ear from damage. With percussive sounds, they can't react fast enough.Examples of such sounds include drums, gunshots, drop forges, and other sounds which have a very short rise time to their loud peak level.
You (the collective 'you') may have heard the term "temporary threshold shift". This happens when the muscles tighten in response to loud sounds, such as when a person goes to a loud nightclub or concert. After a while, they relax, and your hearing returns to normal. Unfortunately, repeated exposure to sound causes the muscles to lose their ability to protect the inner ear, resulting in damage to the hairs in the cochlea, which results in hearing loss.
There is a very good explanation of this in Anita Lawrence's "Architectural Acoustics", as well as in "Why You Hear What You Hear" by Dr. Eric Heller, and in numerous papers in the journal of the ASA.
:)
Edits: 06/11/15
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