anechoic chamber

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anechoic chamber (dead room) Room designed to be echo-free so that it can be used in acoustic laboratories to measure sound reflection and transmission, and to test audio equipment. The walls, floor, and ceiling must be insulated and all surfaces covered with an absorbent material such as rubber, often over inward-pointing pyramid shapes to reduce reflection. The room is usually asymmetrical to reduce stationary waves, which are waves reflected back over their own paths. See also acoustics