A new approach to designing vented-box loudspeaker systems exhibiting approximate third-order responses is presented, and as a result a new family of intermediate alignments is obtained. These alignments are characterized by providing a better transient response at the expense of a less than optimum efficiency in the low-frequency range (provided both fourthand approximate third-order filter functions are adjusted in a similar way). Different cases are illustrated relating to a set of well-known solutions.
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