How to integrate the bass-system/subwoofers with the main speakers, so that the end result actually sounds better.  This involves setting crossover frequency and delay and level, so that the bass system and main speakers integrate seamlessly. Get those 3 steps right, and the result will likely have significantly improved sound quality compared to switching off the subwoofers. Additional steps includes dsp processing - like eq - on bass system, dsp/eq on main speakers, placement of main