the FAQ doesn't talk about changing the low pass because you SHOULDN'T. Leave it max'd out -- the point is to get it out of the way because bass management is handled digitally in the processor (receiver).
The thing about raising but not lowering refers to the crossovers in the RECEIVER. That's the part you are missing
ah ok. thanks to both.
i didn't realize that the receiver could override the sub-woofer physical dial setting. so leave it at max permanently even after calibration and being used day to day. check!