That phase correction is not actually measuring phase itself. It is just changing the phase of a driver to driver interaction, remeasure, check, repeat. There is no gurantees that it is actually aligning the phase the best it can be without measuring the phase directly. You could get the phase correct for that crossover, but now the rest of the system is out of phase or other driver to driver interactions are now messed up.
I would suggest someone only use that if they really know what they are doing. You have just as good of a chance of messing something up as actually fixing something.