Just got those and installed them this morning. Excuse me for the hodge podge of part used for the instal. I will clean-up my act later ;-)
Will try to stick to a two-way system.
First impressions are positive sonicwise. I crossed at 350hz with an 18db slope and applied somme massive correction from 3.5Khz and up. I sure don't have the sizzling highs of the 2405, but so far the sound is pretty clear, and well sprread across the room. According to JBL's litterature, the horn is loading down to 350Hz, and will have an even coverage from 500Hz and up.
The only thing I don't like about those is how third-world the fabrication is. I am used to nice overlays of fiberglass or composites. Those horns are just gobs of "horse hair" mixed with epoxy. Not very sexy. Certainly not nice enough for the $1k asking price on new units.