I have my complete rig now. It's an awesome sight to behold! I'm running it in Bi-amp mode and have some setup questions. Could someone explain the "crossover" setting in a little more detail? I'm thinking it determines what frequencies are sent to which cabinet. True? If so does that mean that at a certain frequency one cab just shuts off and the other takes over? I couldn't tell real well when I was playing it. What is a common setting for this?