Has anyone heard these yet? The only thing that turns me off is having to go through an A/D and D/A conversion in order to use the digital crossover.
I don't know what you believe but if you're asking about feedback from someone who listened to them at a show, I would say that's pretty much a waste. Demos at shows will almost always be poor no matter how good the speakers are. Naked room with flutter-echo, loads of specular reflections and standing waves doesn't exactly create the hifi nirvana. Not to mention very little time to set up the speakers and the challenge with several listening positions.
The question one might ask though is; Does one have to audition speakers at all or is it enough or even better to buy speakers based on measurements? I would say the latter is sufficient and also better. One only need to take into the account the room they will be playing in. Will the room be ok with 72 tweeters firing loads of energy and speakers that disperse almost 90 degrees to the sides?
Double conversion? Not sure I understand.
Use a Hypex DLCP or a miniDSP 4x8 HD. They can work as crossover, converter and preamp. The Behringer DCX2496 is something I would avoid.
An active crossover has clear advantages. You can tailor the response to your room and it's much easier to integrate subwoofers.