Just to add something that's probably entirely unnecessary. I find there's a lot of confusion regarding how to do even the basic settings on a powered subwoofer. I think it comes from the fact that most settings can be adjusted in two places. On the sub itself and in the receiver/preamp. Two volume controls, two crossovers adjustments, two phase settings. There's a lot of misunderstanding of those settings and then there's the belief that room correction means you can just throw things in a room, press a button, and everything magically is optimized. It's just not that simple.