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How do you correlate the SPL with db

I bought a digital equalizer, Behringer DEQ2496, for my system. One of the function in this unit is the RTA. I tried this function, but the scale is in SPL. When I try to compensate the RTA result with the graphic equalizer, I realized that the scale of the eq. is in db. My question is that how do you convert SPL so that I will know at which point that it equals to 0db on the eq. scale. In another word, how do I know at what SPL equals to 0db on the eq. scale. I hope you can understand what I am trying to convey.
Thanks,
fallot

Showing 1 response by kr4

kr4's avatar
kr4
3,713 posts
 
There is no absolute way unless you calibrate the Behringer since dB is a relative measure. That said, the RTA should be scaled in dB as well although probably not the same dB.

However, all this is relative and that may be all you need. Filter magnitude is referred to a base line and the RTA should indicate how many dB +/- from baseline the peaks/nulls are. Sloppy but possible.

Kal
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