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I've calibrated the sound card internally. I've applied the RS-digital correction file. I've set the levels to 75db. But when I take a measurement the graph trace averages 135 db with most of the plot off the chart so it is difficult to view.

Is there a setting I'm missing?
 

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Is there a setting I'm missing?
Yep, after you set the level to 75dB at your listening position with your SPL meter, and then set up the soundcard input level, you must run the Calibrate SPL routine which then sets/matches the REW internal SPL meter to match the Radio Shacks 75dBSPL reading...

brucek
 
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