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I don't think you need to go to much trouble to do a spectrum reading in REW of what is being sent to your speakers. Simply place the REW microphone near field and set up REW to look at the spectrum. I can certainly tell you the controls you need to set in REW to use the spectrum tool.

brucek
 

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it will be limited by the noise floor of your soundcard
Yeah, I would do a quick loopback cable spectrum check of your soundcard first and examine the THD+N and all the harmonics, then connect the device under test. This will reveal the differences you're looking for.

brucek
 
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