Fighting off pirates with noise

American army used noise to repel pirates off the coast of Somalia:

America’s armed forces are also accused of using loud rap music and television theme tunes to disorient and disturb prisoners both in Iraq and Gunatanamo Bay. Another technique is to impose absolute silence as part of a sensory-deprivation programme. And both American and Israeli armies and some less scrupulous police forces around the world are said to have used a sonic tool, the “long range acoustic device”. It emits unpleasant high-pitched wails that are intended to disperse crowds. In 2005 a cruise ship even reported its use to repel pirates off the coast of Somalia. But the effectiveness of the device is subject to much dispute.

Is that all what it takes!.