oh, about: "Did you notice any loss of planar type sound with fewer tweeters on the half Ulfbehrts?"
Can't say, I've never heard the full Ulfbehtrs (or Moab or Encore) or anything with the 7+1+7 setup. The monitors have the 6+1 ring, and I love that setup. As I stated above, I had ML's and full size Maggies in this very same room, with these subs even, and the Tekton midrange is just awesomely fast and transparent, but more dynamics.
BTW not sure if this voluminous thread has linked to the AVS forum post of someone figuring the tweeter ring crossover, but it's very interesting....
We all 'know' only the center tweeter is a true tweeter and the
"6 round the ring" go lower (much lower, to cover the 440hz (?) string of a violin per one of Eric's youtube videos), but the AVS deconstruction noted that the left and right 2 of the 7 go lowest and the top/bottom ones (above and below the center one) go a bit higher in freq - so the high-midrange appears to be a line array by the middle 3 vertical tweeters. and below that in freq, all 7 join in (ie: the 2 left flanking and 2 right flanking also participate). a super elegant way to get around the comb filtering assumed by "yOu h4vE sEVen tWeEters??!!??" people.