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Sound levels
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Author:  Stuart Sweeney [ Thu Oct 12, 2000 6:58 am ]
Post subject:  Sound levels

Salzberg said elsewhere about sound levels:<P> <BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>...which worked out to 100 dB SPL* measured at the back of the house.<P>* If you want to know what this means, go the "Backstage" and ask there <HR></BLOCKQUOTE><P>Please walk us through this one, Jeff.<p>[This message has been edited by Stuart Sweeney (edited October 12, 2000).]

Author:  salzberg [ Thu Oct 12, 2000 12:13 pm ]
Post subject:  Re: Sound levels

OK. I'll try. It's complicated (which doesn't mean I think you won't understand it; it means that <I>I</I> don't completely understand it).<P>"dB" stands for "decibel". It's a relative term; "dB SPL" is the measure of sound pressure level ("loudness"). It's a logrhythmic scale, which means that every time you add 3 dB, you're doubling the volume.<P>As I recall, the figure of 100 db SPL, measured at the back of the house for 5 minutes, was approximately the same level as listening to a jackhammer from 200 feet away for half an hour.<P> <P>------------------<BR>=-=-=-=-=-=-=-=-=-=-=<BR>Jeffrey E. Salzberg, Lighting Designer<BR>Online portfolio, now including "This Day in Arts History":<BR><A HREF="http://www.suncoast.quik.com/salzberg" TARGET=_blank>http://www.suncoast.quik.com/salzberg</A> <P><BR><p>[This message has been edited by salzberg (edited October 12, 2000).]

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