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Maybe I need to re load the program?
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Not likely, it's just an exe.
Is your soundcard.cal file good from 10Hz to 20000Hz?
If you connect a cable from the LINE_OUT to the LINE_IN right channels and do a full sweep measurement with the soundcard.cal loaded and C-weight unchecked and microphone cal removed, is it indeed a perfect flat line response? It should be.
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any reason why REW can't be used for full range measurement?
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Certainly it can, as long as you have a proper full range soundcard.cal and a microphone.cal loaded.
See my thread
here. Look at the graphs.. your loopback measurement should look like the red line..
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Has it indeed been found that the other options are inaccurate? not needed?
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Not needed. If you need individual frequencies, you can use the internal signal generator.
brucek