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Join Date: Oct 2003
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the jbl cabs have a native response that is somewhere in between a butterworth 3rd and 4th order rolloff, so with a protective high pass of 2nd order, that gives a net of 5-6.
so after adding the same 2nd order protective high pass as on the ported cab, adding at least a 1st and maybe a 2nd order hp butterworth to the sealed sub will help get the low end rolloff about right. ~2nd for the cab natively + 2 protective high pass + 1-2 additional = 5-6 to match the jbl ported cab setup.
then the sealed sub will likely need a touch of eq to get it flat to the rolloff point. of the jbl. perhaps something like f=30hz, q=2.0, gain=+2. tough to say though.
then the jbl will need its *top end* rolled off to match the sealed enclosure. something like a 1st order low pass at 60(?)hz might be a decent start, but it is tough to know how hard the inductance will be rolling off the top end of the big guy.
i suppose that another option could be to plug the ports on the jbl cabs, and roll the top end off with a low pass. that might be easier, now that i think about it.