Yes the dual tweeters and midrange is a somewhat unusal configuration but so is the B&W tweeter mounted on top of the speaker and the Nautilus series with its unusal designs. The idea behind the dual mids is that the cone surface area is the same as a much larger driver ala Paradigms 7" mid range, only the dual 5.25's are able to move a little faster as there is less mass to move, they also require less energy to move them. This is no different of a philosophy than the multiple woofers almost everyones uses in floor standers. As far as the dual tweeters, I think they just add more detail, makes it easier to hear that upper end, that is usually covered up by the larger sound of the other multiple drivers it has.
