I am able to equalize my sub to within 3db's of flat from 20hz-50hz. At 63hz, it begins to fall off, and at 80hz and 100hz, it is down by about 12db. Sub phase does nothing to correct this situation- would reversing polarity of the 3 front speakers possibly help? Or is that simply the same as changing the sub's polarity because they are interactive? Sub is in front with the other speakers, and has continuously variable 180 degree phase adjustment. Receiver currently set for 80Hz crossover. I am asking before doing because the speakers are bi-wired and my wife has to do the switching, because of recent back surgery. So I don't want her doing it if the consensus is it won't do any good... All thoughts appreciated. Thank you.