Does calibrating speaker levels at 75db at different levels on your master volume control impact how "loud" you can go. In other words, if you calibrate with the master volume at 40 vs. 50 (arbitrary settings) and you can go up to say 80 on the master volume, do you have more headroom or volume calibrating at 40? Logically it seems that you would because you would have more volume runout on the control. Does this make any sense? or am I just confused?