I emailed Wilson Audio to ask about the upgrade - specifically , if it could be done "in the field" or if the speakers needed to return to Wilson.
Here is the response from them "The Sophia upgrade needs to be performed at Wilson Audio. Let me have the serial #'s and I will check the age of your speakers and inform the upgrade price.
All upgrades are to be performed through a Wilson Audio dealer. I would be happy to direct you to the closest dealer in your area. "
I was really hoping the local dealer could install the upgrade in my listening room, and have me avoid all of the hassle of packing and shipping these extremely heavy speakers. I am much less inclined to do the upgrade if I have to ship the speakers to Utah.
Too bad - I was already softening my wife up!
Jim