A while ago I had a shop put in a headunit and they wired the harness up. Last night I was putting in some speakers. In the back there is the tweet ( with a huge enclosure for tweet I was surprised ) and the 6x8 sub. The new speakers have both the tweet and sub in - one. I'm using the factory wiring and wondering if there is a crossover in line somewhere for the back speakers. Should I just hook up the speakers to the wires that were going to the 6x8 or do I need to jump both the original tweet and sub wires together to the new speaker?