How high? maybe check with Alan as to how high above ear level they'll be effective. I would think they'd have pretty good dispersion, and you could bring them closer to the seating area instead of being restricted to the walls. I know the general consensus is something like 3-6 ft above ear level, but I'll bet there are a few people who've mounted 7-8ft or more above ear level. Just a thought.

Half of communication is listening. You can't listen with your mouth.