I just took a closer look at my Infinity(Reference 3-way 6x9) speakers and noticed that it has three prongs for wiring. It looks like one negative and two positive posts. The second positive looks like it has a small crossover attached to it and it has another, blue, wire coming off of it. What are these for? When I installed them, I just plugged the wiring harness in and neg. to neg, pos. to pos. and I was done. Now I'm going to be adding an Amp to these speakers.
So, what's the story with the third post? Should I be using it somehow?