In the pictures, it doesn't look like his dome tweeters are close enough together to prevent audible comb filtering. In my own array, I've taken the little Dayton Neo's and cut the flange off so tightly that the center to center distance is about .80. This raises the calculated comb level to almost or more than 18,000 hz. This is at a range where, a. I cannot hear adequately anymore due to my age, and b. most people will not be able to differentiate the comb hiss from normal musical tones, in my opinion, of course.But in any case, isn't comb filtering always more audible in the midrange levels rather than at tweeter levels above 12,000 hz?
Pinky