Laboratory response measurements are complex, but tests of loudspeakers in rooms where they are most often used are fraught with even greater difficulties of both a practical and philosophical nature. The laboratory response usually shows sound pressure level of direct sound on the main axis. The response measured in a room is greatly affected by the acoustical characteristics of the room and by the radiation pattern of the loudspeaker. The directional effects of stereophonic reproduction depend upon the direct sound, while the loudness is greatly influenced by the reverberant sound. Which controls the subjective impression of fidelity or reproduction? What should be measured, and how should the tests be made?
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