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I have no SPL meter, can I do it without?
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You definitely need an SPL meter for measuring room response.... They're not too expensive...
To calibrate the soundcard you must first connect a cable from line-out to line-in and select the correct channel (i.e. right) and also select the correct Soundcard device and input output you're using. Select these on the Settings screen under the Soundcard tab. See the pic below..
Check Levelsxxxxx clear.jpg
brucek