heard the 9.3 today at sights & sounds. my impression is that they have similar sound characteristics as the diamond 8's (at least when i compared it with my 8.3). though in my opinion, the 9 series has a little edge in the highs and low frequency area, this maybe because of the larger driver size (8") and the new cabinet construction. have'nt really compared the two diamonds side by side.
but i think the 9.3 is a good candidate for HT application. in terms of audio, i still prefer the AE evo or MA Bronze. I guest you will also need a powerful SS amp to move those big drivers. very low sensitivity too (86db).
this is just my opinion...cheers and have a taste of it.