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Now, what do I do with this data?
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First use an appropriate graph scale.
For vertical, always use 45dB-105dB.
For horizontal in your case, use 25Hz-3000Hz.
Turn on ~1/3 octave smoothing to remove the comb filtering in the uppper frequencies.
Uncheck the soundcard cal and set the target for full range instead of subwoofer.
Redo the measurement at 75dB target level.
After that, you'll have something easier to evaluate.
brucek