Sonic weapons is an idea that has been kicking around for nearly a centuary, patents on the subject first appear around circa 1910-1920.
some examples used rapid detonation of gas to produce the sound,
even Tesla is supposed to have experimented with the idea.
The use of sound as a weapon is well documented across the web, more peacefull applications of the technology include the ability to shatter/ breakdown kidney stones removing the need for invasive surgery.
The field of electromagnetic weapons is a fascinating topic, but we tread a thin line here between enthuisast and terrorist, there is no such thing as a prankster with an emp device, stun/ rail/coil gun.