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After hearing about room calibration, I decided to give it a shot, but it seems I'm stuck on the sound card calibration part.

For reference, I have a UCA202 DAC/ADC as well as a Motherboard Line-in port.
The UCA202 mic input has a noise floor of -60dBFS, while the Mobo is lower, at -85dBFS which is why I want to use the motherboard line-in for calibration. Unfortunately, there seems to be some odd things happening.

Pictures are better than words, so here goes.
Here's sound out from the UCA202 going into line-in, at -12dBFS
uca202 out mobo line in.png

Then Early tests of UCA202 out and UCA202 in, at -36dBFS (output peaks are -3dBFS)
usb out usb in.png

And after repeating various combinations of USB out, in, motherboard out and in, getting pretty much copies of the top two graphs, the UCA202 in/out one mysteriously started working, giving this output.
usb out and usb in #2.png

I'm sure I can use the UCA202's ADC for a mic input (my home-made preamp has 0-60dB mic gain) but wouldn't it be more beneficial to figure out what's up with the motherboard sound input and get that higher-tolerance and lower-noise input option back?

Also, the mic I plan to use us a Behringer XM8500, and the factory supplied a lovely little calibration curve that I can use to equalize the mic; where would I be able to enter that manually in REW?

Regards,
Spring
 

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If the UCA202 continues to give results per the last graph than I'd be inclined to just run with that. Maybe make a point to run a cal before each measurement session just to check.

Mic cal file is entered into Preferences, Mic/Meter tab. I'd take any results with that mic with a grain of salt.
 
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