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The raw test shows the freq response rolling off pretty high, and the compensated test still shows a curve that looks unusable for sub testing.
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The raw test with the loopback cable is the purple line and looks perfect.
You're right, the soundcard ain't great, but the soundcard calibration file (dotted line) compensates and gives a flat response ready for testing.
Many people use an external USB soundcard when they have a laptop for REW.
Once you take a measurement, be sure to post measurement graphs for subs using a vertical scale of 45dB to 105dB and a horizontal scale of 15Hz to 200hz.
soundcard-test.jpg
brucek