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does the RS digital (as opposed to the analog) SPL meter's RCA output send out a c-weighted or unweighted signal.
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Doesn't matter. What is important is that we set the switch on the meter itself to c-weight. The outputs of all three meters are not a perfect track of that desired c-standard, so we compensate for the inadequacies with a cal file in REW to force the resulting graph to be flat.
Our cal files compensate in the area of concern from 10Hz to about 105Hz where the meters deviate from the standard. After that they all are fairly accurate and we want to use the regular c-weight file in REW to take over, so we 'check the box.
brucek