An all-pass crossover is described which is specially suited to realization using a passive high-pass channel that incorporates the closed-back driver. Although the responses of the low-pass and high-pass channels are asymmetrical, it possesses many of the desirable properties of the Linkwitz-Riley crossover. The passive realization minimizes component count, requiring no impedance correction for the high-pass driver.
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https://aes2.org/publications/elibrary-page/?id=11053
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