The theory of band-pass loudspeaker systems is discussed. A reactance transformation method is presented by means of which the Thiele/Small theory of high-pass systems can be applied to the design of band-pass systems. Because the reactance transformation is symmetrical, band-pass systems based on this theory are also symmetrical. The theory of a fourth-order band-pass loudspeaker system derived by applying the reactance transformation to a second-order high-pass system is also included. Higher order band-pass loudspeaker systems are the subject of additional studies in preparation by the authors.
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