All I have connected is the right channel output connected to the right channel input, that's it! I used the pin connector to dual rca's in both output and input. Hit the measure button on REW and did a calibration
and what I get is explained above. Do you need further info?
When you press the Measure button on the Settings page (using the later setup of your pics above, and the loopback connected), it should show the -12dBFS output VU meter, and then when you click through next, it should allow you to set the Input VU meter to -12dBFS.
Looks as though you have a low filter on then. The high end is fine (as is the graph in general), but you have a severe low end problem. Check the equalizer page and be sure no EQ filters are on. Everyone else that has purchased this card appears to get about the same response graph as I have shown in the SRM post.