Krass's post makes me remember that is is important to set REW to output the same sample rate as is default for AIR/Devialet USB. Differences could lead to unpredictable results. I'd fix them both to 44.1kHz just to be sure.
edit: I had a mismatch once and this resulted in a lot of distortion while playing the REW testtone (pink noise). I'm not sure how that would have measured as I heard and corrected this before starting the measurement process.
edit: I had a mismatch once and this resulted in a lot of distortion while playing the REW testtone (pink noise). I'm not sure how that would have measured as I heard and corrected this before starting the measurement process.
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