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I have a concept in mind that would include a 4th order bandpass sub. I would use a straight port around 4" diameter - you can think of it as a box with the port sticking completely out of it. The end of the port will terminate in a panel via a flare.
I've never designed or build a bandpass sub before so I would like some guidance on driver Qts, best practices for designing one, etc. Any tips would be appreciated. I would like to use one or two smaller drivers e.g. not larger than 8" class. There is currently not a limit on the box size but probably 2cuft might be a practical first guess, unless that is way too small. EQ and crossover would be active with a dedicated amp. There will be one of these per side. I would like to cover a band of 35Hz ish (lower is OK) to 100Hz (F3 points).
I can use Unibox to make design choices but need some pointing in the right direction. TIA!