Where is the cap in Superex ST Pro B?

Got a pair of these in fair condition, and had planned to swap out the capacitor based on some posts in another forum I'm not a member of. These have a tweeter and small woofer with a simple crossover. The inductor is mounted on a little cardboard "chassis" that sits on the back of the speaker, but the cap is nowhere in sight. I'm guessing its in front of the woofer cone underneath a plastic housing, but not sure. I really hate to unglue the whole thing if I'm wrong. Anyone got some guidance for me? Thanks.