Hello, I just got a couple questions before I put the sub and install it. My subwoofer is just a single 4 ohm subwoofer. So do I just connect the wires postive to positve to the box and negative to negative to the box. Also I'd want to bridge my amp so I can run this one sub to my 2 channel amp. Is there anything I need to know about that? Any help is greatly appreciated!