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And the graph still showed large peaks and dips
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Sometimes you need several iterations.
Also if your response is not surrounding the target properly, REW has will have an unrealistic reference to suggest filters.
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Basically, it identified EQ filters for the extreme lows and the frequencies above the crossover point. Most of these frequencies were outside of the frequency range for my subwoofer,
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You have complete selectable control over the start and stop range to create filters. Did you set it?
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looks very different from what the REW frequency sweep measured
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REW sweep measurement is far more accurate. Use smoothing in REW to get a result that more closely matches a sixth octave measurement.
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Did the correction values used on the "old analog SPL meter" REW file different from the ones on Sonnie's previous spreadsheet?
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They were matched as soon as the three new calibration files were developed. Hopefully you don't have a really old excel file. Just check the calibration values in the file.
brucek