Ted, The noise figures you posted are interesting, but do not tell the whole story. It is important to know the facts to adequately protect yourselves. OSHA's requirements are politically correct, not scientifically correct. Big businesses screamed about noise controls and had powerful lobbyists in Washington. 8 hours at 90dB WILL cause hearing damage to a goodly portion of the population. The rest of the world starts at 85dB and uses a 3dB exchange rate. (8 hours at 85dB, 4 hours at 82dB, etc.) even that exchange rate will allow a small percentage of the workforce to acquire noise induced hearing loss. When something sounds twice as loud at an increase of 10dB, the sound pressure level--the force of the pressure waves hitting your eardrum--already doubled in intensity at 6dB. We just don't experience the doubling until 10dB. Diane Hofstetter, OHC, AAS-HIS (Occupational Hearing Conservationist, Associate of Applied Science-Hearing Instrument Specialist) PS: Just last month NIOSH, the federal government's branch that deals specifically with noise controls in industry, backed down from last-year's promises to NHCA (National Hearing Conservation Association) to tighten the laws regarding engineering controls for noise protection in the workplace. Date: Wed, 2 Mar 2011 21:19:44 -0800 From: esambell at yahoo.com To: caut at ptg.org Subject: [CAUT] Useful data on loudness Body=http://www.gcaudio.com/resources/howtos/loudness.html I don't know if this has appeard on the list before, but I think it is very enlighyening. Ted Sambell -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://www.moypiano.com/ptg/caut.php/attachments/20110303/b9326371/attachment-0001.htm>
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