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I have noticed that the plot of my manually measured data looks different than in the Excel sheet when imported into REW
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Yes, because if you're importing Radio Shack meter readings that you have already compensated for in the Excel chart and then subsequently apply C-Weighting in REW, the results will be incorrect.
Say no to C-weighting when you import Excel compensated readings. In fact that's the only way to do it, because if you had imported raw RS meter readings, C-Weight in REW wouldn't have been accurate because REW doesn't apply the calibration data.
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Why the difference? Am I doing something wrong?
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The main reason is writen above, but also notice that you have altered the vertical axis of the Excel graph. It should be from 45dB to 105dB to match REW. Also in the horizontal axis of REW you're using 15Hz to 200Hz, where the Excel graph is from 10Hz to 160Hz. You're comparing apples and oranges.
Make the change to the C-weight problem and make your graph axis the same and your graphs will be identical.
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How does my curve look for sub only?
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Perfect. You're done.
brucek