Gentleman:
Don't forget the cabinet construction in your discussion. It is not just drivers that end up in the sound. I owned the Edgarhorn Titan horn system with Seismic Subwoofer for 13 years and it had very vintage drivers which I considered sublime to listen to with SET amplification. Those included the JBL 2441 in the midrange and Bruce's 300hz horn made of solid wood made it sing. The mid bass folded cabinet in mine and the seismic sub. also had JBL/Electrovoice vintage drivers but the cabinets were big and hard to properly brace. The only reason I sold the pair was due to the space in my room. These horns smoked a lot of others out there due to the driver chemistry/cabinet combination. My friends Avantgarde Trios with Bass Horns are hifi in comparison. Point is he likes what they do for him so he wins. I don't care to listen to them.
The Gamut speakers excel in sound not only due to quality timed drivers and crossovers but due to the 21 layers of "specific" Baltic wood used to make the cabinets in their top models. The layers are hand glued together. Why not 22 layers or 19? Because 21 sounded the best to the designer.
A lot goes into the cabinet for the final result is my point. Drivers are only a part of the overall sound.
Gary (gwalt)