Graph isn't showing. You can attach graphs to your posts, follow the instructions here:
http://www.hometheatershack.com/foru...ing-graph.html
When you say 0 on the amp has been calibrated to 75dB do you mean using the amp's test tones or going through the REW SPL calibration?
What mode is your AV amp in (e.g. "Direct", "Stereo") and what range are you measuring over (i.e. what is the sweep range). Are you measuring your speakers or your sub?