Most city dwellers are used to the constant sound of traffic noise, and most office dwellers are used to the “dull roar” created by their co-workers as they type and talk on the phone. Some people cope with the noise better than others, but most prefer a quiet work environment. And for businesses such as recording studios and music performance halls, controlling noise is crucial.

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In spite of all of the technological and cultural progress that we’ve made as a society, one of our harshest realities is that there are far too many incidents involving seemingly normal individuals surprising everyone that they know with unexpected violent behavior. People of all ages, backgrounds, and nationalities have engaged in large scale criminal rampages, and the only thing that they really have in common is the element of surprise. These individuals also have the ability to hurt a lot of people before emergency responders arrive on the scene. In addition to the standard fire and tornado drills routinely performed at schools and government offices, lockdown procedure drills are also becoming increasingly common.

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