If you have no dips, or minimal, then you're there.
Again, crossovers are not brick walls that drop instantly to zero on either side, so the subs will affect the mains for at least an octave above the crossover, and the mains will affect the subs for an octave or so below (how much impact, and how far up/down in frequency, depends upon the crossover slopes).
Again, crossovers are not brick walls that drop instantly to zero on either side, so the subs will affect the mains for at least an octave above the crossover, and the mains will affect the subs for an octave or so below (how much impact, and how far up/down in frequency, depends upon the crossover slopes).