You have to go into the menu and set the rear outputs to subwoofer mode. Then go into the menu and you can choose between 80, 120, 160, and no crossover point. If you just got this deck you have to take it out of demo mode as well. You will know when you have set the rear out to sub woofer mode when you push the volume knobe in the first option to pop up will be sub woofer gain +15 to -15. The deck is hard to get used to, but it has alot of features for a cheap price.