I have no clue who the maker (brand name) of "swr" might be, but that aside I also don't understand the need or usefulness of knowing the "output waveform."
What is the size and shape of your room, and where are you placing the subwoofers? I don't think porting a sealed box is a good idea because that doesn't change the volume of the box. You could potentially get a lot of noise from the port and little useful tone.
EDIT: A Google search finds Alpine car subwoofers. Is this a car installation? Not the best forum for that stuff.