Np @moffer. Would love to see your system setup here on the Gon. I believe ProMusica in Chicago carries the S2 and it sounded pretty good when I heard them.
Yes, with those ribbon tweeters, try to be as precise as you can. You will be rewarded with excellent sound. I recently purchased the Bosch GLM 30 laser measure, and trust me, I was about 1/2" to an inch off using tape measure, trying to measure 6 feet into the room to the front of the speaker face. With laser measure, it is not only easy, it also places the speakers at perfect distance from walls on back and sides.