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wtf? I'm not going to backtrack your math down to almost a billionth.. Human error is by far more inaccurate than calculations... Simplify this better. I'll make it easy for you- Internal dimensions- Height, width, depth. Multiply those 3 in unit of inches and divide by 1728. Now take displacement of port, both subs and bracing and subtract from answer above. Also- if u want destructive lows.. 3-3.25cuft net for these 2 10s would be killer. Going with 2.5cuft is still fine though.

I've already stated my opinions in the previous posts, but I would like to add that I love my xcons. With my subwoofer level set to zero, the bass blends in very well with the front stage, tight as ever, metallica, tool, is just epic, punches to the stomach Playing material with heavy bass like rap or dubstep, subwoofer level turned up, I can see my windshield flex a little, my steering wheel shakes, brake & gas pedals bouncing back against my feet, my hair on the back of my neck standing up. With each xcon only receiving 500watts... Tough choice, good luck

Xcon = better sq, less output. nightshade = lesser sq, more output. Although as long as the enclosure is well designed and made, the nightshade will still perform musically. And enclosure will also play a huge part for output as well. At least that's my opinion.