Hello! Thanks Old school, but what I need to know is really simpler than your detailed answer!

I want to link the test tone output to an equivalent level on a digital media. The goal is to be able to calibrate the actual dB SPL output of the system to reference level.

For example, if the test tone is equivalent to -20 dBfs on a media, I will calibrate the system to output 85 dB SPL from each channels, which is 20 dB less than the reference peak level of 105 dB SPL.

If the output of the tone is -30 dBfs, I will calibrate to 75 dB SPL, so 0 dBfs is still 105 dB SPL.

I work in pro sound and understand all this really well, I just want to know the test tone equivalent level!

Thanks again!