Is this really what you'd expect from an audio balun
Construction of these transformers doesn't have to follow the normal
rules. They don't need good linearity, so very high permeability
ferrite can be used for the core in order to get a high inductance
value. This is because the audio doesn't have to pass through the
ferrite, it bypasses it.
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I know of no transformer type in which the signal "passes through" the core
material.
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