A crossover system for a two-way loudspeaker system is described, in which the high-pass channel incorporates the parameters of the associated closed-back tweeter, to realise a desired fourth-order high-pass filtered acoustic output. When that output is combined with the output of a second-order low-pass filtered woofer, the summed response is all-pass. With no impedance correction required in the high-pass channel, the system produces an inexpensive but precise crossover. An alternative fourth-order Linkwitz-Riley system is also described.
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https://aes2.org/publications/elibrary-page/?id=11219
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