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I have'nt used REW in a while ,. im able to produce a sweep , but the result is allways a flat line?

Any ideas why?
 

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I'm gonna guess your levels are too low, or the scale is wrong. Try the left slider. The measurement might be at the bottom. Just a guess.
 

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It look like a measurement of a loopback cable. Measuring a wire gives a nice flat response like that when the calibration is correct.
In REW Preferences Soundcard tab have you now selected the correct measurement channel - The one with the mic connected? The REW default is channel 2 (the right channel) for the mic, but you can change it to match your connections.
 

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It looks like a valid measurement of a wire. That would not be the result I would expect if the program, connections, or PC was not working.


If you have gone through all the connections and REW settings and don't see a problem you could post the mdat file here and let us take a look. It may have a hint as to what is wrong or at least rule out a couple of things.
 
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