What is the theory behind mid-point referenced transformers — balanced versus unbalanced?
Only the balanced mid-point referenced transformer can be used in a “midpoint wiring” system since it performs like two independent transformers on its secondary side. The secondary coils of an unbalanced midpoint referenced transformer are magnetically coupled to one another so that the loading on one secondary will affect the loading of the other secondary, making midpoint wiring impossible. You must consult the manufacturer or the manufacturer’s literature to be certain as to which type of transformer design is being utilized in a particular model selected for a specific application.
