For design purposes, the transfer function of a so-called bandpass subwoofer, which is designed to handle frequencies at the lowest end of the spectrum, is best viewed as the convolution of a high-pass response defining its low-frequency cut-off, with a low-pass response that defines its crossover to a complementary high-pass response of a “satellite” system. The 2nd-order function that defines the high-frequency limit must now be included in the design of the crossover process with the remaining drivers. The design approach ensures that both monophonic and stereophonic woofer output will integrate with the overall system response. Tables of alignments for a range of combinations of high-pass with low-pass responses indicate that when the low-pass factor of the transfer function is peakier than is desired, drivers can be chosen with more convenient values of parameters.
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