I agree with John.

You don't want your sub doing just the lowest frequencies that your mains can't do. A good sub is much more efficient and better designed to handle all the broader LFE range so you want to remove the task from your mains and let them concentrate on what they do best, some low bass likely but mostly all the midrange and highs.

It's the perfect blend you are looking for, not a hard cutoff. 80 Hz is kind of the defacto standard for people who don't want to tweak. That's where bass starts to become non-directional and also, as mentioned, a crossover is not necessarily a hard cutoff (snips off everything below or 80 or whatever N it's set for.) It is where it begins more of a rolling off of the lower frequencies to the sub. Some of the frequencies just below 80 or N will still get sent to your mains in order to keep things blending nicely but it will start to roll off fairly steeply after N.


With great power comes Awesome irresponsibility.