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Multichannel Level Alignment, Part III: The Influence of Loudspeaker Directivity and Reproduction Bandwidth

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The correct level alignment of multichannel reproduction systems is critical to the quality of the reproduction. This, the third paper discusses the results of three experiments employing the nine test signals discussed in Part I. Experiments employing six subjects using the method of adjustment have been conducted in a standard listening rooms using a symmetrical loudspeaker set-up. The influence of directivity characteristics of the loudspeakers used for the front and surround channels has been investigated and the influence of high-pass filtering the center and surround channels has also been examined. The results show that there is no significant influence of directivity characteristics for the front channels. This also applies to the surround channels when using standard loudspeakers that produce both a direct and diffuse sound field component at the listening position. A loudspeaker that only produces a diffuse component will have a significantly different calibration of the surround channel. It is suggested that the effect can be explained by simple changes in the SPL at the listening position. The use of high-pass filtered center or surround channels does not have a significant influence on the calibration.

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