What I did with my sub was to set the subs crossover to start around where my main speakers bass stopped.
The mains only went down to about 65hz IIRC, so I set the sub at about that point. You can adjust it either way to try to make the blending of bass smoother and more natural.
I also set up the sub to match the amps power. The sub is 100w, and the amp 65, so I set the sub to about 65 on the dial, and this seems about right.
You'll probably want to play a dvd or two just to see how each adjustment sounds, because no matter how much a dial setting may seem the best on paper, it's how it sounds in your room that counts. Use the dials to get it in the rough area where you think it should go, then adjust accordingly.
My mistake was to think full everything was the way to go, but the bass sounded wooly and overpowering. Turning the crossover down gave a tighter response, and turning the volume down to match the amp gave a better blend of sub to speakers.
This probabaly isn't the most technical method, but it worked for me in my lounge set-up, and I didn't have any sound meters to help me at the time. Try it and see how you get on.
Looks like an awesome sub by the way!!
Gary.