So if the factory amp can't be bridged, then would the second example (not the diagram with the 1ohm amp) work?That is called bridging. The factory amp will not run like that. It will fry. Just use one set of wires from one side of the harness. Why are you trying to bridge?
But then it would be running at 4ohms since it wasn't being run as parallel I assume, so it would be the same either way? So would I then need a 2ohm dual voice coil sub and wire it like example 2 to get the best output from the sub?
Sorry for all the questions man I really appreciate your help.