Your Samsung is a HTB. You can't use it with the Denon. I am not clear as to what you want to do here, but FYI, I can tell you there is a sub-woofer connection on the Denon as well.
Question with my home's Denon AVR 1513 Receiver and a Samsung HT Z310 Home Theater System.
My receiver has just 5 ports for the surround sound systems (2 Fronts, 2 Surround, and 1 Center). While My Samsung Home Theater System came with a DVD receiver (which I am not using it to plug my ports in) and 5 speakers and a subwoofer.
So if I just go with 5-speaker system, then I can't use my subwoofer. Is it possible to tap the subwoofer into the center speaker and they flow into the same port of the receiver? The impedance on the Receiver is 6 ohms per port and the speaker's impedance is 3 ohms.