So im building a bass cab, and have 2 JBL 2226h's on hand, and plan on getting a midrange driver. I want it to be as small as possible, and I was looking, it seems like Isobaric is a good way to do that. However, acording to winISD it will bring the sensitivity from 97db/w to 94db/w. But, since its 2 8 ohm woofers, does that make it a 4 ohm cab? So then I get twice the power into it? Also, im not sure quite how isobaric works. Would the drivers be facing each other or not? And in winISD it give a volume of the cab, does that include the space between woofers? Also, could I coaxially mount a 6.5" driver in front of the 15" woofer without it getting in the way of sound?