{A}coustic

Acoustic
{The processes, materials and interior features used to control the nature and propagation of sound. For example, acoustic panels buffer, direct or reflect sound in a concert hall in order to create the correct level of amplification from the position of the audience. The aim of acoustics in this instance is to improve and amplify sound, whereas in a recording studio, for example, the desired effect is to muffle and absorb sound to avoid echoes and feedback and ensure a clean recording.}

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definitions from The Visual Dictionary of Interior Architecture and Design