A procedure is developed to design linear-phase all-pass two-way crossovers systems using IIR digital filters. The resulting filters can be used if linear-phase response is a priority. It is also shown how from those crossover filters in-phase crossovers can be derived, which produce good off-axis response for noncoincident drivers and exhibit low phase distortion. These in-phase crossovers can be useful when a good off-axis response is needed and phase distortion is to be minimized. An efficient implementation of these filters is described. The derivation is generalized to obtain in-phase crossover filters for multiway systems, and an efficient implementation is presented.
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