About OZONE ... Read chemical encyclopedia, basic literacy. Ozone at temperatures above 158F breaks, cold plasma is very difficult to obtain for ozone. For use powerful arc lamps (efficiency = 1%), where a lot of ultraviolet light, and it adds an oxygen atom. very not for long!
Information about the absence of mechanical parts, to overload as much as you do not break in touring work is important. Ribbon afraid overload and expensive + amp? Price?
I think the sound of EAL much better than any of-Ribbon. Type PRO work in a group, pick up the required number and receive power in high fidelity sound.
While for outdoor can not come, only inside buildings.