i am trying to buld a bandpass box specificaly for two infinity 120.1se kappa series and i cant get the right internal dimentions for Vr1.60ft3(45.31liters),Vf 0.62ft3(17.56liters) port dimentions are 9.52"l, 4"diam. fo=65.0 Hz can any one help me with that and tips to buld the box...