Wayne Parham Messages: 18786 Registered: January 2001
Illuminati (33rd Degree)
Room modes are less a problem in large rooms. The bigger problem in gymnasiums is the hard, reflective surfaces on all sides. It makes a midrange reflection problem, and a lot of echo. The directivity of the speakers will help, and that's sometimes as much as you can do. But you might also pad the walls, if possible. Gymnasiums often have padding for safety reasons, and it serves double-duty as sound damping material. It isn't much, but it helps.