I would be interested in upgrading the newer speaker.
Mr. Thiel is targeting the older models first partly because he thinks the X.7s are starting with better technology. Just guessing here but it will probably be late summer or fall before the first round of kits are available from Coherent Source. Anything for the X.7s will be beyond that timeline.
posts are on the back
Same with my SEs. Not an issue as the external cabinet is attached via cable or umbilical cord. Probably an inch or three between the cabinets. Actually, that brings up another disadvantage of the outboard solution: cost. In addition to the extra cabinet, cabling between the two is needed.
Thiels rule!
I’m optimistic that the new boards will elevate them to the next tier. As I wrote elsewhere, probably my last speaker.