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Why the "A" response scale?

I'm quite interested in your rational for describing the "A" weighted scale for SPL sound calibration. Can you give a bit more detail?

Typically the "A" scale is used to quantify the amount of "damaging to the ear" SPL levels in the workplace or anywhere else for that matter. Because of this the scale is limited in frequency response (no bass) to the range -> 500Hz to 10kHz.

The "C" scale, on the other hand, measures over a more musical range from 32Hz to 10kHz. Measuring with the "C" range may also capture room mode peaks when using pure tones as the test signal source, but this can be corrected by using "warble" tones such as those found on the "Stereophile test CD disk 2 & 3".

I recommend using the "C" scale, or you will never be able to calibrate your sub correctly in relation to the rest of your speakers.

Now the meter does have some deviations from flat response, but those can be corrected for by applying well known adjustment figures available here as the "RS SPL meter correction values".


bstan

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