A class ofcrossover systems is described, Which produuce mllresponses in their high-pass and low-pass oufi,uts at,fiequencies &se to thetransition. crossovers frequency As a re.snlt, both outputs have a hrgh initialrate qf attenuation in their stop-bands, while the sum oftheir outputs has a flot.all-pass, response. When the nulls are moved to very high and Iow fPequencirs.the tramfer. functions degenerate into Butterworths, ftir odd order. andLinkwitz-Rileys, for even order. Active and passive realisations are presented.The work is the subject qf a patent application.
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