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FunctionAn anechoic chamber is an echo-free room. Such a room was (and still is) used in acoustics to perform experiments in nominally free field conditions. This means that all sound energy travels away from the source with almost none being reflected back (hence the term echo-free room).
Harvard's Psycho-Acoustic Laboratory had a smaller (than Beranek's box) anechoic chamber in Memorial Hall for its studies with human subjects.
Primary SourcesLeo Beranek and Harvey P. Sleeper, Jr., "The Design and Construction of Anechoic Sound Chambers," Journal of the Acoustical Society of America 18 (1946): 140-150.
ProvenancePsycho-Acoustic Laboratory , Harvard University