2-Port Inline Port 1 = Positive Port 2 = Negative 3-Port Inline Port 1 = Positive Port 3 = Negative 3-Pin XLR Pin 1 = Positive Pin 2 = Negative 4-Pin XLR Pin 1 = Positive Pin 2 = Negative 3-Port House Port N = Positive Port L = Negative 3-Port House for Panterra and Gio Port N = Negative Port L = Positive 3-Pin House Pin N = Positive Pin L = Negative Polarized C7 Round = Positive Square = Negative   Coaxial Inside = Positive Outside = Negative RCA Inside = Positive Outside = Negative Polarized Port = Positive Pin = Negative