As multichannel sound systems become more widespread, the issues of how to obtain optimal sound reproduction become more apparent. Although the matter of level calibration is rather trivial for stereo sound systems, it has been found that it does critically affect perceived sound quality. The more complex and often suboptimal multichannel setup introduces a whole new range of problems in this respect. This paper aims to provide some background on the questions surrounding multichannel level alignment and discusses some of the topical issues and research currently in progress.
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