High Level Input. Answer ASAP PLZZ

Quick question. The High Level Input connector has 4 wires. White(+) White/Gray(-) Black(+) Black/Grey(-). Its a powered subwoofer so everything is already to go. My question is, should I connect the High Level input to the original factory sub woofer wires? And if so, how do i connect the 4 wires from the High Level Input, to the 2 wires that are going into the factory subwoofer from the factory amp? Being a subwoofer, there are no right and left channels correct? Would just using the White , White/Gray off the High Level Input suffice?

Would really appreciate it if someone answered this as soon as possible. Im trying to get this thing in my car today=p