A design method is presented for the realization of the class of Linkwitz-Riley corssover networks for which the transfer function of the upper frequency driver is included as part of the transfer function of the high-pass network. The method is described in detail for a fourth-order crossover system, and techniques for its extension to higher order systems are given. A quasi-Linkwitz-Riley crossover network is defined which increases the order of the active filter for the high-pass network by 1 while approximately maintaining the desirable phase and amplitude characteristics of the Linkwitz-Riley network.
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