I went to far as to look at some sites on speaker design, but I don't think I've presently either the time or tools to take this on. Too bad, though, as the only additional cost beyond the $125 for the Motion 10 would be the cabinet. Of course, if both mids were used, it would be a large center speaker...I've half a mind, on a whim, to purchase the Polk center channel currently going for $70. It has two 5.25" drivers (same diameter as the Motion 10's) and room for the Motion 10's tweeter between the two. It shouldn't work, really, as the Polk's cabinet was designed for Polk's drivers. But, for the time and money, it might be fun to try. If I'm careful, I might be able to do the swap w/o rendering the process irreversible on either speaker. The worst and probably most likely outcome would be a terrible sounding speaker. In that case, I could restore each to it's original condition and move on to a real custom cabinet project. And use the Polk in the interim. It would have to be better than my current excuse for a center channel speaker.