Graham North wrote:
> A weighting simulates the human ear, which typically has a poor high and
> low frequency response, so if you have a sound with a lot of high and
> low frequency content C weighting will give a higher figure.
>
> http://en.wikipedia.org/wiki/A-weighting
>
> There are standards for measuring all types of noise; environmental,
> noise nuisance etc, I recommend you do some digging on google if you
> want to measure things correctly.

Oh, I see. So I'm getting higher numbers for C weighting because it's adding 
the equipment vibrations and low-frequency noise to the A weighting.


> Don't expect any measurements from that meter to stand up in court
> though :-(

Why not? :)

By the way, the guy who came in and charged $200 for an hour of yapping 
about other people's sound problems, had a meter just like the one on 
Wikipedia.

Vitaliy 

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