I'm missing the point. I just leveled my sub against my loudspeakers with an SPL meter and Sound&Vision DVD, and then adjust the receiver volume depending on the source...
Why would I want to adjust the sub again if I've already evenly matched outputs? 
"Did you know that more people are murdered at 92 degrees Fahrenheit than any other temperature? I read an article once. Lower temperatures, people are easy-going, over 92 and it's too hot to move, but just 92, people get irritable."
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