@jmarshak
Internally balanced has nothing to do with it. You can have the circuit be internally single-ended and still support the balanced standard. In such cases transformers are used.
An example of what I'm talking about- if the source puts any signal return currents through the shield (IOW if the shield is important to make the connection) then the equipment does not support the standard. In a proper balanced connection, the shield is for shielding only with no other relationship to the audio signal, quite unlike a single-ended connection!
Internally balanced has nothing to do with it. You can have the circuit be internally single-ended and still support the balanced standard. In such cases transformers are used.
An example of what I'm talking about- if the source puts any signal return currents through the shield (IOW if the shield is important to make the connection) then the equipment does not support the standard. In a proper balanced connection, the shield is for shielding only with no other relationship to the audio signal, quite unlike a single-ended connection!