all i know is that the subwoofer is powered by the plug. And there is a Scart Adapter sort of thing which has a Red and White wire in the adapter and going into one of the sets of inputs on the Subwoofer which is for my tv channels.
Then the xbox is connected by going from the Xbox to the tv and being plugged into the Component In section with a Red, White in the Subwoofer, and a Green, Blue and Red into the Component In section on the tv.
Hope that makes sense