Loudspeaker testing in reverberant rooms

In the diffuse sound field of a reverberant room acoustical intensity is directly proportional to the acoustical power emitted by a source and inversely proportional to absorption in the room. If the room and microphone characteristics are known, pressure response curves of loudspeakers can be plotted which are proportional to the total acoustical power radiated by the loudspeakers. The instrumentation procedures used in mean energy density (MED) testing are described in detail with particular emphasis on the facility at the Jensen Manufacturing Company, and the role of MED measurements in the evaluation of loudspeakers is discussed.