I've never really installed speakers before other than on a home theater in a box with black/red speaker wire. I have a home surround sound system with in ceiling speakers. Five of the wire pairs enclosed in white PVC were pairs of black and red which I connected to my receiver. Five other blue pvc enclosed wires each consist of a black, red, green, and white speaker. These cables connect to in-ceiling speakers outside and in other rooms of the house. Where does the green and white speaker cable go to? How can I connect the remaining cables to my receiver (there's only one pair of front speaker wire inputs left after using them up for the theater surround inputs). Do I have to get another speaker switchbox? Thanks if you can help this confused newbie.