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Crossover design based on median level and phase correction within a listening window

PA and sound reinforcement loudspeaker systems consist, many times, of two or more frequency bands reproduced by horn loaded transducers with phase plugs in front of the drivers, and horn loaded compression drivers. The size, design, and arrangement of these elements inside the cabinet are restricted not only by acoustical reasons but by mechanical constraints, such as weight, gravity center, and the total available volume of the cabinet. Besides, the lack of directivity match at crossover frequencies is usual. Due to its own architecture, it is sometimes difficult or impossible to find a good reference point for crossover design which provides proper crossover and symmetric radiation around this point. In these cases, a crossover design based only on the on-axis responses cannot be optimum in regards to uniformity of coverage. A method based on the alignment at different angles within a listening window to get a representative median level and phase correction, and posterior phase optimization based on maximum average level at crossover frequencies is presented. For certain designs, this method can provide better radiation pattern at crossover, better average level response within the intended listening window, and smoother directivity transitions between ways.

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Permalink: http://www.aes.org/e-lib/browse.cfm?elib=20947

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