Thanks Peter, I'll give Scott a call Monday. I think I may have gotten a dud. Not only do my calibration numbers have wide swings as mentioned above, but when I exit the OSD and return to music the -10 channel is very low while the +9 channel is very loud. Whereas the SPL meter said the calibration dB between the two was equal. Also, all channels play all of the information received (source connected via HDMI). For example, the display shows front L & R + SW, but all seven speakers play.