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Discussion Starter · #1 ·
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?



Premium Member
134 Posts
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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