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A Contribution to the Objective Investigation of the Frequency Response Characteristics of the Multiway Loudspeaker Cabinet Systems

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The objective investigations of the frequency response characteristics of the four-way loudspeaker cabinet system JBL 4343 were carried out. The investigations were performed in an anechoic chamber, a recording studio, and a control room of Radio Beograd. More than one hundred frequency response characteristics were obtained under different measurement conditions. The comparative analysis was carried out to determine the influence of the measuring microphone position and the acoustic characteristics of the surrounding. The measurements confirmed that the frequency response characteristic could be improved by reversing the polarity of the bass driver and using the built-in contour controls. Unfortunately it seems that it is not enough for small control rooms in the low frequency range because of the influence of room resonance phenomena. The sound pressure level fluctuations exceeded 10 dB. In principle, one can find a rather flat frequency response characteristic by changing the positions, either of the measuring microphone or of the loudspeaker system, but in practice this is not applicable to small room conditions. The only possibility to solve the problem is the use of a graphic equalizer. Some subjective tests of the loudspeaker system quality were carried out equally.

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