erik_squires - - nice explanation. My first thought looking at that rather appalling frequency curve is the HOLE in the midrange from 2k-4k (-4db) is due to the crossover not allowing the tweeter to play low enough or the midrange to play high enough. That assumes that either is capable of playing in that range. Assuming the drivers were capable of playing that range without significant distortion, a bit more overlap would likely have filled that hole nicely.
The other thing that stands out to me is the ascending frequency curve. That curve runs contrary to the universally preferred descending "Harman Curve" that is favorable in most real world listening conditions.

