ok i just got the Car stereo cook book today and i did some formulas.....My cutoff freq is 32.2 Hz.....the Ffb = 41.4......Fob=77.0.....Vof=0.28 this might help some people.......this is what i was thinking but i need a box for 2 12'' subs not 1 (http://img30.imageshack.us/my.php?image=35cubes32hz5075sqin1aw.png)