I wondered about that as well, especially since the SS tweeter works so well in XLs. I suspect space had something to do with it, since one of the goals was to have a state-of-the-art center with more compact dimensions than the Essence. Additionally, I suspect the vertical dispersion was carefully considered since these are more likely to NOT be placed at ear level and the morels could have a better off-axis response. At any rate those Morel compact domes are as easily recognizable as the sliced-paper mid-bass drivers from SS!
