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Do you see my reasoning, or am I overlooking something?
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What you're overlooking is that no matter what the soundcard you use, it's response inadequacies are compensated with a calibration file, and its output/input level anomolies are compensated for during the REW setup where all the levels are set to a level of (for example) 80dB. The entire purpose of the exercise is to get filters set in a BFD or to modify room layouts/ equipment placement for the best response.
Once the equalization filters are set on the BFD, then it is of no matter what level you play back through your system.
brucek