A signal-carrying circuit that employs two signal-carrying conductors plus a ground. Each of the two signal conductors carries the same signal potential but with the polarity of one reversed with respect to the other. Any noise that is induced into the circuit will be common to both "legs" and on arrival at the destination, is cancelled out by combining the out of phase signals. Applies equally to balanced lines. Balanced connectors are generally 3-pin XLR or TRS 1/4" jack.