That article describes a theoretical infrasound weapon, not something that is being used today: But this [infrasound weapon] has seemed to be not a very practi

That article describes a theoretical infrasound weapon, not something that is being used today: But this [infrasound weapon] has seemed to be not a very practical weapon, since large banks of speakers were required to provide directionality, and power demands were deemed excessive. The article goes on to describe LRAD which does exist and has been deployed, but is a high-frequency weapon, not an infrasound weapon (and can be defended against with a good pair of earplugs).