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Hope I have made a school boy error and it can be sorted simply.
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The
C-Media CMI8738 looks like a nice card. I do see where they supply just the
drivers on their site. If all else fails you could uninstall the C-Media software package and then reboot windows, at which time it would "find new hardware" and would ask for the drivers if it needed them.
Either way, it sure looks like you have all the settings correct. I was hoping to see a mistake. You did say you loaded the software package from C-Media. This means in the Windows "Control Panel", there will be an icon to start that software package and play with its features. Look again that in addition to only enabling the card for two channel, that no wacky features are turned on. If that doesn't clear the problem, I would try the software uninstall and let windows handle it all on its own.
The last resort of course that can be used is to get the best soundcard calibrate file you can get and then edit it to remove the frequencies above where it starts to mis-behave. The file is a simple text file and can easily be editted with notepad and then resaved. Simply delete the entries above a certain frequency and point REW to the file as if it was fine. This works and simply doesn't provide compensation above that chosen frequency (i.e. 1000Hz)......I suggest this because in the frequencies of interest (i.e. 10Hz -200Hz), the file appears fine to do the job
brucek