Okay here's what Tom from SVS answered me:

"I would start out with the subwoofer volume knob at about 25%, and then adjust the receiver's built in leveler from there."

So that's less than mid-way....while wbwatts in your case you gain control is more than mid-way (2o'clock) right or counter clockwise??

Anyway I will try all the possibilities here and we'll see....I have to wait my neighboorhood living upstair to leave her apt before I start doing this (don't want a police came knocking on my door....) :-)