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What is the "proper" way to assess decibels?

post #1 of 7
Thread Starter 
The noise a fan makes is generally rated in decibels but the unit is extremely variable depending on how far away the sound sample was taken from (i.e. standing two feet from a fan versus two inches from a fan and taking the measurement)

I was considering just using a mic and looking at the decibel meter, but because of the above reason I haven't tried it.

I'm curious to see just how loud my rig is, but what is the proper way to assess it?
post #2 of 7
I don't really think there is a standard distance, you would just measure it then state the distance. I'd say to test from about a meter though.
post #3 of 7
Thread Starter 
Quote:
Originally Posted by Taylorsci View Post
I don't really think there is a standard distance, you would just measure it then state the distance. I'd say to test from about a meter though.
So based on your claim, doesn't that mean all these decibel values hold no validity?
post #4 of 7
IIRC the standard is 12 inches, in a sound proof room that is specifically setup for this type of testing.

Which look like this.

Edited by eclipseaudio4 - 4/22/11 at 5:24pm
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post #5 of 7
Quote:
Originally Posted by kiwiasian View Post
So based on your claim, doesn't that mean all these decibel values hold no validity?
You mean like a monitors dynamic contrast ratio? It wouldn't be the first time a company used lack of standardization to make their product seem better. I don't believe there to be a standard distance, but if you wait a little bit I'm sure someone will come along and put me in my place.

Edit:
Quote:
Originally Posted by eclipseaudio4 View Post
IIRC the standard is 12 inches, in a sound proof room that is specifically setup for this type of testing.
There it is.
Edited by Taylorsci - 4/22/11 at 5:26pm
post #6 of 7
Thread Starter 
Ok, well since I don't have access to a completely sound proof room I'll just do a crude 12-inch mic test and see.
post #7 of 7
standard for speakers is 1w @ 1meter
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