There is another route you can go. It is definately a big enough box to convert into a subwoofer. After all, the internal volume of your speaker is bigger than most subs out there. You would remove everything that is inside it and turn it into an empty box. Give it some extra bracing inside, build a new motor board and install a 15" or even an 18" sub driver. Over at AVS, there is a DIY thread devoted to building speakers and subs. They can steer you to the right equipment and info needed to make a great sub out of your Lascala.
