One goal of acoustical engineering can be the reduction of unwanted noise, which is referred to as noise control. Unwanted noise can have significant impacts on animal and human health and well being, reduce attainment by pupils in schools, and cause hearing loss.[1] Noise control principles are implemented into technology and design in a variety of ways, including control by redesigning sound sources, the design of noise barriers, sound absorbers, silencers, and buffer zones, and the use of hearing protection (earmuffs or earplugs).