The performance of a small anechoic chamber of inexpensive construction is described. The chamber was built within another room, and acoustic absorption material was also mounted in the outer room. The room rests on a concrete slab which is supported on heavy density fiberglass board. This fiberglass board in turn rests on second concrete slab which is supported on sand. The room is constructed of concrete blocks, sealed with concrete plaster. Inside the room, sound absorption is accomplished with a thick fiberglass blanket containing a muslin septum, and with a thinner blanket laced on a network of pipes to form a wedge construction. Both conventional loudspeakers and a spark discharge were employed as sound sources for measuring the response of the room. The performance of the room is shown to be very satisfactory throughout the intermediate audio frequencies for the calibration of equipment and for measurements on speech.
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