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Discussion Starter #1
I'm getting a different response curve depending on how many sweeps I do. One sweep gives a relatively flat response, but the treble drops off the more sweep iterations I do. I'm using the UCA-202 soundcard and the UMM-6 microphone, with supplied cal files.

To my old ears the response from the one-sweep run sounds about right.
 

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REW Author
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Using more than 1 sweep with different input and output devices is prone to not working well - the clocks of the two devices are not synchronised and timing alignment may not be maintained between the sweeps. If the devices are actually running at different sample rates with the OS doing some intermediate re-sampling things get even worse. Best sticking to single sweeps when input and output are not on the same soundcard, I may add a warning along those lines in REW.
 
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