i have def tech speakers bp8060 towers along with cs9060 for the center and a denon avr-4000. Im trying to figure out how to set up the speakers since i dont have a dedicated sub. Each tower and center channel has a sub. Should i put the speaker on large or small on the set up. How do i set up the receiver or make it think i have subs when there is nothing plugged into the sub port in the back?