Mongoose solidifies your low end by collapsing your bass frequencies to mono. Out of the box, it gives you a tighter, more focused low end. It will give you better translation to headphones by eliminating the awkward stereo low frequencies that can go unnoticed on monitors.
Just set your crossover frequency, and all sounds below that will be summed to mono. You can also add a bit of stereo widening to your higher frequencies to get a wide mix without the the issues that arise with a wide low end.