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Message: <blockquote data-quote="squeak9798" data-source="post: 868629" data-attributes="member: 555320">Useless?  Not all of them.  Basically, a bandpass box is simply an "acoustical" crossover (highpasses and lowpasses the sub).  Bandpasses are also usually very efficient within the passband (the bandwidth of frequencies that the sub is playing).4th order bandpasses, when designed correctly, can actually have transient response better than/equal to that of a ported box.  So, you can actually acheive pretty good results with a properly designed 4th order bandpass.  6th order typically has very poor transient response, and isn't really ideal to use.Problem with bandpasses is that they are somewhat tricky to design, and require much larger boxes than sealed or ported.  So, you don't see them very often in the car enviorment.</blockquote>

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