Why not 70 volt? Are you implying that a speaker that comes as a 70 volt model won't cut it?
Perhaps that's true. I helped install product at Nobu in Malibu, where a couple of outdoor subwoofers are matched into the 70 volt system. Killer sound, and that with the surf less than a hundred feet away.
Try Tannoy. Soundtube. sorry I don't know model numbers.
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw