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SimonPac
2
Jun 1, 2018
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Balanced audio connections do not use the signal/power ground as one of the two wires required to convey a single (say left channel or right channel) audio signal. Instead each of the two balanced wires for a channel carries the same waveform but 180 degrees out of phase (phase inverted) with respect to the other, each waveform being of nominally equal amplitude. The main potential advantage is that the ground (0V) connection of the equipment is not carrying an audio input (or output) signal.
There is no inherent reason for balanced inputs to work better other than superior common mode interference rejection and the avoidance of ground loops. Neither possible problem is normally a major factor for domestic audio at line levels. If the amplifier is truly balanced throughout it is possible that signal current in the ground path will be reduced slightly, to the benefit of distortion but again this should not be an issue in well-designed equipment. A truly balanced throughout amplifier may generate a more complex distortion characteristic because it essentially contains two separate amplifier circuits, one handling the in-phase signal and the other the out-of-phase signal. Again, hopefully not a real issue.
A true balanced output stage will be able, potentially, to deliver twice the voltage swing and four times the power into a given load, for the same DC voltage used to supply the amplifier. A balanced headphone amplifier with a balanced headphone lead will reduce ground wire intermodulation of the channels, though only very slightly unless the lead, whether within the amp or the external lead, is of very poor quality, and carries the left and right channel grounds for a significant length.
The number of AC power transformers in a piece of equipment is entirely unrelated to whether the equipment is balanced in signal operation. Some equipment uses audio balancing input transformers to convert from balanced to unbalanced or vice-versa. These are normally very small and shielded magnetically and electrically.
A stereo DAC requires a minimum of 2 DAC circuits. A balanced stereo DAC requires a minimum of 4 DAC circuits. Many DAC chips contain more than one actual DAC circuit. The number of DAC chips is not a direct indicator of balanced or unbalanced operation.
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