Box response changes slightly with the two driver orientations, a little more extension with one and a little more midband gain with the other. That said these boxes are hardly "subs" by todays standards with a response that falls off the cliff at 50hz and is anything but flat from there up so the rated -3db point of 45hz is creative writing at it's best. If these cabs are reproductions and you don't have original DL18MT drivers consider your lucky because some of these copies work better and just about any driver built in the last 20yrs is an improvement over the original EV.