I bought a new set of 12's. Included was woofer parameters, but i dont know how to build a box with only that info. Ive fooled around with the info on the web and came up with around a 3 cubic foot box with a 4x4 square vent that is 12.25 inches long for one woofer....sounds a little long to me...now this could be totally wrong, but if it isnt, if the two woofers share 6 cubic feet does the port need to change?? Please help guys!!!