Unbalanced output method is the most commonly used method by DACs which consists of “left and right signals + ground line”. This setup includes a ground line which blocks out external noises from the outside. However, since the ground line cannot block out all of the ambient noises completely, external noises can be mixed into the signals that are transmitted, which then result in changes to the sound. The longer the signals travel, the more external noises that will be mixed into the sound which is why it is used within a short distance of 1 to 2 meters.
Unlike the unbalanced method, the balanced method has an additional cold signal to compliment the hot signal which reduces the external noises.
The balanced method has a few advantages over the unbalanced method. The first advantage is that the hot signal and the cold signal will remove the external noises received. The second advantage is increased output due to the 2 transmitted signals.
Since the ground line cannot block out 100% of the external noises, noise will appear on both the hot and cold signals. The alignment of the 2 signals allows the noise to usually appear at similar points where they will eventually be removed as the signals are transmitted.
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