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Measure from 0-1khz, and then I switch to "Generator" Sine Wave, Frequency tracks the cursor, and the results according to the SPL meter are different
And indeed they should be different.

You are comparing apples and oranges.

REW creates an impulse response by means of a logarithmically swept sine wave, and the frequency response and all other graphs are created as a result from this impulse.. This cannot be compared to the level received from a single frequency, long duration sine wave.

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