I would say that depends upon what your REW shows. Both your sub and your prepro have correction limitations. My room has such terrible nodes that I PEQ'ed both of my Plusses, then ran YPAO (Yamaha's PEQ), and then polished them off with a DSPeaker Anti-Mode 8033 subwoofer PEQ. There are a lot of filters in the loop, but it's the best I could do. (Remember, when trying for a flatter frequency response, it's
much better to cut peaks than to boost dips.)
Not to worry, it might be a little work, but you will end up loving your new SVS.