[GaryWT]

My unit has the 2 speakers in the main cabin on A, the outside speakers are C and the B wires are connected to nothing. I wish there were speakers in the bedroom but there are not. Thought about adding them because to play a movie in the bedroom, you need to use the speakers in the main area. To hear you had to up the volume and my son hated the noise in the back. Instead of adding speakers to B we bought a DVD player and use the tv speakers instead go the built in DVD player.