The basement of my home is pre-wired for a 7-channel home theater system. The bundle of speaker wires to be connected to the receiver include a coaxial cable for the subwoofer, two 2-conductor wires seemingly for the two front speakers, and two 4-conductor wires that I assume are for the surround back-left and back-right and the surround left and right speakers. There are 7 junction boxes on the wall and on the ceiling. I have made successful connections between the two 2-conductor wires in the bundle and the two front speakers. I have not tried the connection for the subwoofer yet, but one of the junction boxes on the front wall has a coaxial cable coming out that apparently matches its counterpart in the receiver bundle. So far so good for the connections with the three junction boxes on the front wall (i.e., the two front speakers and the subwoofer),but my confusion starts from this point on.\n\n\nThe junction box on the back-right of the ceiling has a 4-conductor wire coming out, and I connected them to both the surround back left and surround back right speakers and tested one of the 4-conductor wires in the receiver bundle. Both speakers played. However, the wire coming out of the junction box of the back-left of the ceiling is a 2-conductor wire, and I don't have any 2-conductor wire left in the bundle for the receiver that can be used to connect to this junction box. I have near-zero knowledge about the pre-wiring setup, so I have made an effort to learn abut this online. I read somewhere that pre-wiring professionals often start with one 4-condutor wire and then split it into two 2-conductor wires at the other ends for two separate speakers. My confusion is twofold: (1) The wire coming out of the junction box for the surround back-right is not a 2-conductor wire, but a 4-conductor wire that makes both speakers play. (2) The 2-conductor wire coming out of the surround back-left junction box, when connected to the surround back-left speaker, does not activate the speaker. I tried these connections both by using a battery and by the actual receiver playing the sound. \n\n\nThe situation for the two junction boxes designed for the surround left and right speakers are analogous, and I assume the answer to my questions above should also apply to these two junction boxes. \n\n\nAm I missing anything here? What should I do to make the connection through the surround back-left junction box, which has a 2-conductor wire coming out, work?