Sound reduction is essential to maintaining peace of mind in the modern world. More than ever we are barraged by a background din of unwanted noise. It is particularly hard to concentrate when sounds from one space filter into a work environment that is meant to be private. This is especially so in open-plan offices, but as more people are working from home offices, it is a growing problem in the home. Distracting noise reduces efficiency and increases stress. Acoustic privacy is critical not only in boardrooms, consulting rooms, and health care settings but in residential spaces as well.