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Hi
The amount that a transformer would care would be largely down to the properties of the transformer, how the windings stack, capacitance between differing windings and so on.
It all depends how well 'balanced' you want it to be and over which passband and out of band.
It is easier to predict or design for accurate balance on parts other than the transformer.
For a 'line level' signal, a balance which allowed say 60 or 70 dB common mode noise rejection is probably adequate and quite easy to achieve. Mic inputs should be better if possible (it is possible of course but at rather greater cost). Just sticking a pair of unselected 1 percent tolerance phantom power resistors can completely mess up the best intentions.
Matt S
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