Rider issues notwithstanding.. I think if you were to ask guest engineers to keep the level between 95 and 100 dBA on the high end you will be fine, assuming they are professional.
Of course A-weighting is technically completely inappropriate for such high SPL levels since the A-weighting curve reflects the human hearing response at levels closer to 40dB(SPL) and at 90 and 100dB(SPL) levels grossly undercompensates for the low and very high frequency contribution. However, it has become widely accepted and in some cases for the very fact that it allows increased low frequency content.... What it really comes down to is that perceived loudness has multiple factors including the not just the amplitude of the sound pressure level but also the sound's frequency content and dynamics. Single number dB(SPL) criteria are very limited in how they can account for such factors.
Good stuff, Brad, thanks for posting this.However... any noise exposure regulations I've seen use A-weighting.So while I agree with you that A-weighting is far different from human hearing response at high SPL, the use of A-weighting in noise exposure standards would seem to indicate that A-weighting must be a reasonable model as far as noise-related hearing damage is concerned.If you've seen anything that indicates otherwise, I'd love to know about it.
Yes, the A-weighting model correlates with the hearing-damage model. Audibility has nothing to do with it.Your ears can enjoy and sustain without damage a ton more dB at 30 Hz than 3 KHz. At 10 Hz the difference is even more extreme.
A weighting is intended for relitively quite sounds-like below 80dBSPL or so.But that does not keep people from putting a meter on the A scale and "measuring something-no matter how wrong that measurement is.But they get a reading-so "therefore" it HAS to be true .It has been said by the experts that above the 80dB point (or somewhere around there), C weighting should be used-as it more closely relates to hearing damage.But then there are different kinds of "experts" that have different opinions.
... It has been said by the experts that above the 80dB point (or somewhere around there), C weighting should be used-as it more closely relates to hearing damage....
I'm not up to speed on research in that area so I'll take your word for it. However, if that's true, can you explain to me why every workplace noise exposure standard I've ever seen uses A-weighting rather than C-weighting?
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