the resistor thing is most likely just a capacitor, blocking the high frequencies to the tweeter. if you have 2 wires going to the woofer, then 2 wires from that going to the tweeter, just use the two wires going to the woofer for the input to the speaker, cut them, then crimp on some connectors that should have come with your new speaker.
i have the monsoon, so i had 4 wires running to each door, which is nice if you put in components with big crossovers like my SS exacts, mounted the crossovers in the trunk
