B&W DM100 tweaks

I have a pair of c1985 B&W DM100 bookshelf speakers. They have a really great sound with my tube amp, but in the true DIY spirit, I was wondering what tweaks could be done on them, with regards to XOvers and box tweaks. I was thinking about swapping some caps around and possibly some noise damping inside the boxes.

Has anyone get any suggestions for good mods? Has anyone got any B&W general mods?