DIFFERENCING BETWEEN DECIBEL (DB) ADDITION IN ROOM ACOUSTIC DESIGN AND LINE ARRAY LOUDSPEAKERS DESIGN

Jose Mujica () and Ramon A. Mata-Toledo ()
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Jose Mujica: Escuela Superior de Audio y Acústica, Caracas, Venezuela
Ramon A. Mata-Toledo: James Madison University, Harrisonburg, VA. U.S.A.

Journal of Information Systems & Operations Management, 2020, vol. 14, issue 1, 130-139

Abstract: Historically, in the textbooks and based on the physical formula of the decibel, audio authors and practitioners have stated that “if we double the number of equal-sound sources we get an increase of sound output of + 3 Decibels.†However, since the line array loudspeakers (LAS) boom, we have seen correlated source systems where audio engineers stated that if these sources were also doubled, it was possible to obtain + 6 dB. This conclusion has been presented in many professional forum, conferences, and professional papers. When asked why this is so, in general, presenters justify this result as a direct consequence of the Sound Pressure Level Formula (dBspl). Although this justification is true for correlated sources, among the audio profession, the concept of dBspl has always been used undistinguishable with that of the Intensity of the Sound in dB. For this reason, in the acoustic design of a room, it is necessary to use a different value, namely, the Root Mean Square of the Sound Pressure Level. That in some system is possible to obtain one result but not in others has created confusion among practitioners. In this paper, the authors attempt to shed some light on the confusion on the use the concept of the dBspl as it relates to room acoustic and the loudspeakers design.

Date: 2020
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