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Shouldn't the lower frequencies be higher dB on the graph when the correction file is applied? Because as you can see, the opposite happens.
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When the C-Weight box is checked in REW it applies the inverse standard C-weight compensation outside the areas where it doesn't find a calibration file. So if you have no calibration file, then inverse standard C-weight will apply.
The calibration file isn't that far off the C-weight file, so you might not notice too much difference.
You should always have the C-weight box checked though, so it can carry on above the ~100Hz upper limit we have set for the calibration files. The reason we only went to 100Hz is because after that the RS meter is quite close to C-weight standard.
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Also I have the SPL meter set to "FAST" and "C WEIGHTING". Should "Compensate for C Weighting" be turned on or off in REW?
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Set the meter to slow and C-weight. Load the calibration file in REW and check the C-weight on.
When you post graphs, set them with a vertical axis of 45dB to 105dB and a horizontal axis from 15Hz to 200Hz. That way everyone is comparing the same axis..
brucek