hear, i dunno where u got 1.some cubic ft, but tht box was caculated already, tht box have 4 cubic ft appx, 2cubic ft, for each compartment, 36"width of the box, and 17"height of the box, and 18" deep, port holes are 4" diameter jus want to noe the length of the pipe,
resonance frequency (fs) is - 26.1
sensitivity (db) - 86.1
subwoofer 12"
net displacement 122.1 cubic inches (2001 cc)

tht should be it.... i asume u got confused with the numberz??