Adrian,On the other hand, with no crossover it's a lot harder to screw up. Have you seen some of the measurements made at Soundstage? Similarly, Dennis Murphy (I think) has been discussing the bizarre measurements he got from one of the Norh speakers and designed a brand new replacement crossover. Particularly when I see a speaker with three or more drivers, I get very nervous because you have no assurance that the designer had any idea what he was doing.
One other factor, for me at least -- and I recognize it is utterly subjective -- is that I just find single drivers (at least the Fostexes I've heard) non-fatiguing and easy to listen to. I can listen to my $140 tube-amp-on-a-board driving a pair of Fostexes all day without fatigue.