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The reason I did it that way, instead of plugging directly into the sub was that I have two subs running off a mono output on the back of my pre
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I don't quite follow, but anyway, generally you will ensure the PC's soundcard is in standard stereo mode with no effects, etc. Then you plug the line-out of the soundcard into the CD or AUX input of your receiver (some use a Y-adapter here, or just feed left and right from the soundcard). Select the standard crossover you use in the receiver and ensure your receiver is in stereo mode. Now the signal to the sub(s) will have your normal bass management engaged without effects. Also ensure that your subwoofer(s) themelves don't have their own low pass filters engaged in the frequencies of interest. Turn them fully clockwise to eliminate them from the mix or they'll fight the receivers bass management.......
Select the same crossover in REW, so that hopefully the response you receive (after a sweep) tracks that target. It should. Apply filters to make it so...........
Yes, an 80Hz crossover will begin dropping off way before 80Hz. That's how they work. The signal will be down -6dB by the time it hits the crossover corner frequency.
brucek