This add-on board is designed to provide a pair of balanced audio
outputs for the High-Quality Stereo DAC (Digital to Analog Converter).
Two 3-pin male XLR connectors are used for the new outputs and they can
either replace or augment the existing unbalanced outputs without
affecting their performance. Balanced audio is used in recording studios
and on stage because of its improved noise immunity.
Picture of the project:
This is due to the fact that the signal is sent differentially (ie, as
two signals 180° out of phase) and then converted to a single-ended
voltage signal at the far end. If any noise is picked up in the cable,
it affects the two out-of-phase signals equally so that when the signals
are subsequently subtracted, most of the noise is eliminated.
In addition, the DAC’s performance at the balanced outputs generally
exceeds that of the unbalanced outputs, although only by a small margin.
The signal-to-noise ratio, frequency response and channel separation
are all better, although we measured a tiny bit more distortion from the
balanced outputs. However, both levels are so low as to be almost
negligible.
Circuit diagram:
Comparison chart:
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