Using an air vortex cannon to focus the sound waves from the bass reflex port, it ‘wiggles’ the flame out in a matter of seconds, as illustrated with a thermal camera.

In Romania, however, the use of sound systems for crowd manipulation is part of what is known as the "Revolution Dossier," the case that seeks to bring key figures in the events of December 1989 ...

The weapons, which are illegal in Serbia, emit sound waves which can trigger sharp ear pain, disorientation, eardrum ruptures or even irreversible hearing damage.

Serbian authorities' use of a sound cannon against protesters fuels anger Under pressure, the government admitted to having the weapon, which has never before been used in Europe – but denied ...

An unknown auditory, crowd-control device briefly caused panic at a protest on March 15. Read more at straitstimes.com. Read more at straitstimes.com.

They then played 1,590Hz sound waves from the speaker array to glide the ball through a pre-planned path while microphones detected feedback known as a scattering matrix as it bounced off the ball.

In Romania, however, the use of sound systems for crowd manipulation is part of what is known as the "Revolution Dossier," the case that seeks to bring key figures in the events of December 1989 ...