Thanks for everyone's advice.
I'll have to get back to the forum on the dimensions of the room.
The walls are concrete block, floor is hardwood. One "wall" is really a set of pull out hard plastic bleachers with a gallery hallway above it. Ceiling is untreated (no sound treatment) steel on...
I found myself in an acoustical nightmare recently, and would love any suggestions. Picture a large high-school gymnasium, filled with 40 or so large round tables for a formal dinner, in the center a large elevated runway on which a live auction is held. Now add 300 or so adults (who have been...