Ok, don’t laugh until you try it, because these solutions are definitely not “high-end audiophile” approved. However, IMO, either of these solutions would work well to decouple and support your 200-pound speakers on your wood floor.
The first solution is to use elastomeric platinum silicone hemispheres that, when attached to the bottom of your speakers using the supplied adhesive backing, would hold the speakers in-place while providing a combination of elastic support and damping at a cost of $32 for both speakers (link).
The second solution uses high density 1-inch thick wool felt, which is an excellent damping material. While decoupling your speakers and damping vibrations, the felt would also allow you to safely slide the speakers around on your wood floors. For your 200-pound speakers, I would probably place four of the 8x10-inch pads under each speaker, for a total cost of $56 for both speakers (link). The grey might look a little funky but, if you move the pads back a bit from the front edge, I doubt you would even see them. There is a company that can cut square footers of the 1-inch thick dense wool felt in black, but those would be more expensive. If desired, the pads could be held in-place by adhering them to the bottoms of your speakers using 3M Double Coated Tissue Tape (link).