Bureau of Sabotage
How to Dodge and Disarm the Sonic Weapon Used by Police
But while whistles emit sound waves in all directions, LRADs concentrate the waves in a narrow cone of sound, extending about 15 degrees in every direction from the axis, like a flashlight. This “directional” sound wave packs the typically diffuse kinetic energy into a tight space, bombarding those in its vicinity with a powerful tone that’s an annoyance at a distance … and a serious medical threat up close.
“Remember that the LRAD beams sound in a narrow pattern, so move off to one side to get out of the main pattern,”
“If it is used as a communications device, put in ear plugs and check out the scene for routes of escape from possible injurious exposure,”