At 15 locations, a bi-directional beam configuration, rather than omni-directional, is used
to direct sound in two primary directions to provide the most effective coverage of the
area. In these cases, an 800-watt or 1600-watt speaker-pair produces a sound output
level of 114 dBC Leq and 116 dBC Leq, respectively at 100 feet in the direction of each
speaker-pair based on measurements taken at GTRI. For both the omni-directional and
bi-directional configurations, a 576 Hz fundamental tone frequency was used in the
computer analysis of the model.