![]() ![]() ![]() ![]() 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. At a distance, an LRAD deterrent tone may sound like any other alarm.īut 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. The principle behind using an LRAD as crowd control, rather than for long-distance communication, is similar to the idea behind a whistle or a siren: they all emit tones in the most sensitive range of frequencies for most humans. ![]() Watch This Protester Instantly Neutralize Tear Gas
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