I've gone back and forth with different settings and have to agree with Gonk. Raising the crossovers seems to strenghen the bass response. If you have a good/accurate sub, let it produce the lower base. The important thing to remember is that a crossover is a slope, not a fixed value. Setting a speaker to it's -3db point allows a significant amount of lower frequency data to be sent to that speaker.

Still, it seems to be a waste to have full range speakers sitting there with high crossovers.

Let your ears be the judge!

John