True balanced circuits About Hifi  xlr cannon balanced

True balanced circuits

A balanced connector really stands for true balanced circuit?

A balanced circuit is used to reduce the noises and interferences on very long cables.  It has two identical conductors, but with different polarities. At the end they are mixed together to recreate a perfect noiseless signal.

True balanced circuits About Hifi  xlr cannon balanced

A balanced circuit

True balanced circuits About Hifi  xlr cannon balanced

A balanced connector

True balanced circuit

True balanced circuits About Hifi  xlr cannon balanced

Notice 4 identical circuits. To make a true balanced circuit you need two channels for the right one, and other two for the left one

Rebuilt balanced circuit

True balanced circuits About Hifi  xlr cannon balanced

There are two identical circuits, but a true balanced connection needs 4 channels to be mixed in two. To make this and to reduce costs, the manufacturer use opamps to duplicate the signal for the balanced outputs.