Given a multi-channel loudspeaker system, in a typical single or multiple listener setup, the combined response of the loudspeakers will exhibit significant fluctuation around the crossover region due to noncoincident positions of any two loudspeakers. This fluctuation manifests as an undesired broad spectral notch or a peak around the crossover region. The spectral notch, for example, introduced around the crossover due to complex addition of the two loudspeaker responses, generally, cannot be compensated with only magnitude response equalization. In this paper, we present a recipe for compensating the spectral notch around the crossover region by designing a digital equalization filter using a stable all-pass network.
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