1 - Get a real soundcard with at least a 10 band eq you can manually set incl. in the software, and plug your headset directly into the card
2 - Bass gets in the way of hearing footsteps, so if your the headphones suck at bass prob a good thing for fps
3 - Eq settings aren't universal; they depend on the headset and your preference
4 - Check out Mad Lust Envy's headphone guide if you are considering switching headsets (He lists top 10 competitive)
5 - Set windows audio to 5.1