A denominator of a transfer function of a symmetrical band-pass loudspeaker system can be presented as a product of three or four second order polynomials. Every polynomial can represent the denominator of the transfer function of an electrical filter. The product of remaining polynomials forms the denominator of the transfer function of a non-symmetrical loudspeaker system. Then, various combinations of these polynomials give various possibilities of realization of the entire system.
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