SB210 uses two 10 inch "Aluminum/Ceramic Composite Diaphragm" drivers
(the description sounds very much like an Infinity driver)
2-inch edgewound/ribbon voicecoils.

Question(s): anyone had one of these apart to look at the quality of the driver?
(or know of any documentation beyond the SB210 spec pdf)

Pondering the use of two per side for the bottom of a 3-way direct (not horn)
system...

Toole/Devantier "Technical Report on CMMD" (next to last pic in file might
include the driver I'm curious about)
http://www.harmanaudio.com/all_about_audio/Cmmd.pdf