This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Hi Bob, You are right -- total noise exposure. There's a tradeoff between dB = SPL and total duration of noise exposure. Lower noise levels can be = tolerated for longer periods. Very high noise levels can be tolerated = only briefly. It's all laid out by OSHA at the following URL: http://www.osha.gov/SLTC/noisehearingconservation/index.html Somewhere amongst all their documentation is a handy table of dB SPL vs. = duration of exposure. Peace, Sarah ----- Original Message -----=20 From: Bob Hull=20 To: Pianotech=20 Sent: Saturday, August 16, 2003 11:43 AM Subject: Re: "Put a plug in it" Isn't it not only the level of dbs but the duration of the sound that = is important in causing damage to your hearing? There is a cumulative = effect on your ears. For instance their is a length of time that you can = withstand the sound level of a lawnmower per day before hearing damage = is likely. I always wear hearing protection to mow, run the leafblower = and many things in the shop. Since the length of the sound we hear at = 100 dbs or so is short while tuning I wonder if the cumulative effect is = enough to damage our hearing. =20 Bob Hull Richard Oliver Snelson <rsnelson@bwsys.net> wrote: I did some sound level measurements on several pianos in my shop = this week. The DB meter was held at about the distance my ear would be = from the strings and soundboard. Using solid rather strong blows I = measured sound levels well over 100 dbs on both grands and uprights.=20 What started this was the testing trick with the fingers that = someone mentioned a few weeks ago. For the last year I've had problems = setting the unisons on G7. Having to turn my head to focus and hear them. = Turns out I've got quite a bit of hearing loss at that frequency and = above, in my left ear. Turning my head allowed me to compensate for it with = the better right ear. At 67 years old, I'm not too surprised at the loss = in my left ear. However I'm sure that it's come on quite quickly. = Several hours a day pounding out tunings has made it worse. As a result I'm = not ! only carrying ear plugs, I'm using them. I tell the customer they = help to filter out noise that I don't need to hear. I do take them out of = my ears when I reach the last octave, for the unisons there. There = seems to be a difference in the brightness of the sound when taking the plugs = out at that time. I'm sure it's a result of not having the previous 45 = mins to 1 hr of 100 db plus sound levels thumping on my eardrums.=20 I thought you might like to know about the 100 db plus levels... Regards to all. Rich _______________________________________________ pianotech list info: https://www.moypiano.com/resources/#archives -------------------------------------------------------------------------= ----- Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/0b/fd/a4/5e/attachment.htm ---------------------- multipart/alternative attachment--
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