Thanks, JohnK. So the receiver basically figures out the speaker's sensitivity by the trim coupled with the distance settings? Is that right? Otherwise, I don't see how it works. Calibrating at one volume level wouldn't really show the receiver the speaker's sensitivity, since distance would be a factor in the volume, right? So does it, in fact, use both trim and distance figures to create a curve for the speaker's sensitivity, or am I still missing the boat?