Todd, that certainly will work. Just to add to Rick's comments, one point to be aware of is that the frequency markings on the sub "crossover"(actually just a low-pass filter on the sub, not a full crossover)control are often inaccurate, as tests for example by Tom Nousaine have shown. I have no idea as to how accurate the markings on the X-Sub may be, but don't rely entirely on them, but set it for an audibly pleasing blend with your M22s, which presumably would be nearer the minimum on the adjustment range.
