Hello All. I have a question for you. I purchased a Yamaha RX V6A, Open Box New for $450. It’s set up and running well. However, in the Crossover section, my Subwoofer is clearly absent. The sub outputs normally. Crossovers for my Fronts are set to 80 and the Center is also set to 80. Why is the Subwoofer absent from the Crossover section?