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Most people suffer from frequency specific hearing loss. If you did an acoustic survey of your home and work place you could probably figure out what frequencies to look for the most loss in.
I was a sonar technician on a fast attack submarine it was a serious concern.
A good place to look for good hearing protection would be a local shooting range if you have one nearby. The people that work there probably take their hearing pretty seriously.
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I have gained this from philosophy: that I do without being commanded what others do only from fear of the law. - Aristotle
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