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From: hrs@homxb.UUCP (H.SILBIGER)
Newsgroups: net.audio
Subject: Re: Headphones and Hearing loss
Message-ID: <674@homxb.UUCP>
Date: Tue, 16-Jul-85 08:41:52 EDT
Article-I.D.: homxb.674
Posted: Tue Jul 16 08:41:52 1985
Date-Received: Thu, 18-Jul-85 03:51:25 EDT
References: <30200012@gypsy.UUCP> <227@harvard.ARPA>, <359@creare.uucp>
Organization: AT&T Bell Labs, Holmdel NJ
Lines: 28

The OSHA Federal regulations on hearing protection has the following
limits on exposure to noise:
	Sound Pressure    Maximum
	   Level, dB(20uPa)	   Time, hrs

		85		hearing monitoring required	
		90		8 
		95		4
		100		2
		105		1
		110		.5
		115		.25

Levels over 115 dB are not permitted.

These levels apply to sound fields. Because of characteristics of the
ear canal, an additional 3 dB can be allowed when using earphones
of the closed type.

It is possible to get a hearing loss from listening to music at
excessive levels over earphones