Hi, the last speaker to upgrade and then, I am perplexed! The front right hand speaker has two cables, one is green while the other is blue, whic hwould be the posiive and which one is the negative? I went through the diagrams (I already installed the headunit) and these two colors do not show up any where ??? I know they are the speaer wires because I pulled them out of the factory speaker, help!!!