If you're talking about using the sub from the Panasonic setup, you're going to want to get a new sub asap. The M22s are great for HT, but frankly, I doubt that the Panny sub is really going to cut it. If it's the one I've seen before, it's about a foot square x 6 inches or so, with a single 8" woofer and a port.

I am the Doctor, and THIS... is my SPOON!