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but I assume it's improper to "assume" that the analog input has a similar characteristic to the spdif, see I'm hoping to use this to at least look at my system response, not just the room response...
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The goal of course, is to remove as much influence from the test equipment as possible. That's standard practice. Unless you have a digital out and a digital in on your soundcard that a calibration file can be created, then it will never be as accurate as the analog out and in. I'm not saying you shouldn't use the digital. It just won't be as accurate as the analog in this situation.
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when I did the cal for the sound card, I included the Eurorack in the loop
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Yep, that will remove inaccuracies - most people do this. It doesn't completely remove the first mic stage from the measurement, but it's a big help because it allows compensation of the line output amp and any response problems with the three band equalizer in the 802 mixer. I certainly use a cal file that has the 802 included.
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any issues, other than the RCA cable was abit longer than the phono cable?
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No issues here. The cables aren't long enough to consider a problem....
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Is 48db a fair cutoff there?
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For sure. Go ahead and play a 30Hz 48dB signal at the listening position. Can you hear it? No.....
brucek