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The major disadvantages of the LRAD system are:

The loud sounds the LRAD emits may cause permanent hearing damage to those within its range.
The LRAD sound wave can be cancelled altogether through the use of common earplugs. The better the earplugs are at blocking sound waves, the less effective the LRAD is.
Sounds emitted from the LRAD can be reflected back to the source by using a flat solid object.

Disadvantages to po polsku wady, ale pierwsze lepsze źródło znalazłam, więc ;-)

When we can't dream any longer we die.
Emma Goldman