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It came with a calibration printout of the response
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Yeah, the pdf doesn't reveal much as to the accuracy down to 10Hz. This is usually necessary for low subwoofer work. I suspect its fairly flat from 30Hz up to about 10K though.
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The neutrik input has 2 different gain levels depending on what type of connection is used. Are you saying to use a jumper from the line output to the hi-z input and leave the preamp turned off? Then when I actually measure, use an XLR connection to use phantom power?
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The manual shows the A and B mic/line connectors as a typical combo XLR and 1/4" jack.
If you use the XLR, it passes the signal through the low level mic preamp and then it would be buffered through a line amp. You use this for the mic.
If you use the 1/4" TRS jack, it supports hi impedance high level inputs from guitars and also standard line-level inputs. It's the line level input you'll be using for the soundcard calibration. Once that's done and you remove the loopback cable, you'll plug in your microphone using an XLR connector and turn on the phantom voltage.
The loopback cable will go from one of the line-out jacks. (it appears these can be set for typical consumer -10dBV or +4dBu pro level in the software setup). I don't know what you'll be feeding these with when you measure so I can't comment there, but in the soundcard calibrate you'll set this output standard and adjust the line-in level accordingly.
Here's the bottom line. Get a cable with 1/4" TRS plugs on each end. Connect it between a line-out and A mic/line-in and do the soundcard cal routine. Remove this loopback connection and plug your mic with its XLR connector into the A mic/line-in and turn on the phantom power. Feed the line-out to your receiver.....
brucek