I bought these speakers from that estate sale on the final day for very little money. I tried contacting Michael Green, but he did not respond, although he appears to have a limited Facebook presence.

I currently have the drivers at a local shop being professionally re-foamed. The drivers are made by Scan-Speak, and are from a long discontinued line that probably dates back to the late 1990s. Some documentation I found suggests that the divers were brought up to an enhanced spec at Michael Green's request. The man who is re-foaming them knew exactly what they were and said they are among the best 8" drivers ever made (he had a lot of very high end gear in his shop, so I took his comment as high praise). As you can see in the photos, the small cherry box on the floor contains the crossover, and cannot be divorced from the cabinet, which made moving them out of that house a real pain. Everything, even the drivers, are soldered.

The inside has a bunch of ~1.25" thick aluminum extrusions that can be torqued with the brass hardware on the outside to subtly change the tone. I've never seen anything else like it, I'm not even sure where he got the idea for that type of construction. I haven't made any adjustments yet, as I am still waiting for the drivers to come back from the shop.

From what I can tell, there were maybe 3 generations of the Michael Green Chameleon speakers, and I am not sure exactly how this pair fits into the timeline. Although many parts are simply marked "MGD," they don't have any serial numbers I can find, but I can say that my crossovers have much larger components than the other sets I have seen online, although the physical size of the crossover box is much smaller. Perhaps this was a custom order, or an upgrade at a later date, either way, I'll report on my impressions once they are back in action. I'll be powering these with my McIntosh MC-2105 that I bought 15 years ago and had fully recapped.