It is shown that the filters used for passive realization of two-way constant power and all-pass crossovers can be used to produce three-channel crossovers of the same types. Although their behavior will approximate the desired response, new filter classes and careful realization of bandpass sections are necessary to achieve it exactly. The new filters and methods are derived and passive synthesis is discussed.
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https://aes2.org/publications/elibrary-page/?id=11767
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