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so is that graph reasonable for before calibration?
No, you need to first do a soundcard calibration.

Then you need to ensure the soundcard calibration is correct by doing a response check of a loopback cable. You should get a flat line if all is correct.

Then you remove the loopback and do regular measurements with an SPL meter using the correct calibration file for the meter that you are using..

brucek
 
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