It all depends in the horn being used. For that fact, to have more high frequencies and if I was Tim, I would use SELENIUM D210Ti driver instead of Eminence PSD2002. Again, the listening window is so narrow at 16KHz that it's only 15º to the left and 15º to the right from the speaker (sweet-spot). Another way is to go with a speaker including the Vifa tweeter, flat to 20KHz and a real Hi-Fi home-runner with a large listening window both vertical and horizontal.
Cheers.