Get a miniDSP equalizer on the sub only. You'll love it. :)
Don't try to fix the null too much. If it resists, leave it alone, but clipping the peaks and tilting the bass the right direction (peaking around 20hz, about 1.5 db/octave down after that) will be incredible. :)
Don't try to fix the null too much. If it resists, leave it alone, but clipping the peaks and tilting the bass the right direction (peaking around 20hz, about 1.5 db/octave down after that) will be incredible. :)