Yes he has a large room, not sure on the size but I will find out again.
Now the kicker for you all for the surrounds he is using is our black clearance cabinets cut for the extremis and we did a custom design with the G3 series for him.

These are located on the side walls as well as rear wall for the surround.
So he technical has more than 18 Extremis in his room

John the ribbon is our short G3 series ribbon made from Aurum Cantus.
And yes ,this ribbon is not listed on our site .
Really we had it for the arrays only.As it is the shortest out of all the G3 makes for a better array tweeter.