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Any thoughts on whether I should load the correction file, or is it enough simply to calibrate the SPL in REW?
The results are meaningless without the correction file. The calibrate SPL has nothing to do with correction except to balance levels between the real meter and the REW meter.

Load the correction file and apply the changes to the mdat files. Use the Impulse Response Windows 'Apply Windows' button after loading.

You will then need to redo all your filters.

brucek
 

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Load the mdat file that was created without a calibration file.

Load the calibration file.

Click IR Windows.

Click Apply Windows in the IR WIndows popup while watching the response graph to see the change.

The graph will now reflect the results with the Calibration file.

Save the new mdat file.

brucek
 

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Am I missing something?
Yep, I just don't know what it is.

If you examine the Radio Shack digital meters calibration file at 20Hz for example, you can see it will add +6.5dB to the signal from the meter at that frequency. So, you can see how it would be impossible for the graph not to change at all.

brucek
 
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