Matt,
I don't recall how we got there, but we've been using the A rating for
over 12 years. Seems like the A rating was the closest to what humans hear.
We even hired a noise person to double check our readings (at $1000 a day!).
--Pat Kelly
----------
>From: "Matthew D. Murray" <MDMurray@gwns.com>
>To: "NER (E-mail)" <nersolo@ner.org>, "'FCSCC List (E-mail)"
<FCSCC-MEM@yahoogroups.com>, "Teamdotnet (E-mail)" <autox@autox.team.net>
>Subject: FW: Fairfield County Sports Car Club Event Oct. 28th (Connecticu t)
>Date: Tue, Oct 2, 2001, 9:12 AM
>
>Seems like we should use a "C" weighting.
>
>Matt Murray
>
>-----Original Message-----
>From: Jay Mitchell [SMTP:jemitchell@compuserve.com]
><mailto:[SMTP:jemitchell@compuserve.com]>
>Sent: Tuesday, October 02, 2001 12:01 PM
>To: Matthew D. Murray
>Cc: Evolution-Discussions (E-mail)
>Subject: Re: Fairfield County Sports Car Club Event Oct. 28th
>(Connecticut)
>
>Matt Murray wrote:
> > So if we want to be cautious, perhaps we should be using "C."
>
>Definitely.
> > Well > transmitted low frequencies (as well as high freqs.) could
>annoy the locals. > True?
>
>Definitely. I think we can safely say that the "boom-car" phenomenon annoys
>some folks (can't imagine why ;<), and there's very little sound above 100
>Hz being radiated outside the car by stereos of this persuasion.
> > Relying on a neighbor who can only hear 1k to 3k might be a bit
> > risky. :^)
>
>"A" weighting doesn't _eliminate_ low frequencies, it just gives them less,
>well, weight. However, almost any broadband noise source will produce higher
>SPL measured with "C" weighting than with "A." So "C" weighting is the
>"safest" from the POV of neighborhood annoyance, but a bit more difficult
>wrt muffling requirements.
>Jay
>
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