You have a device running on 115V.
When you use it with a step-down transformer, you worry about the negative impact of the step-down transformer.
But when you use it with an isolation transformer that also does 230V -> 115V, you start hearing the improvements.
Note that some step-down transformers are autotransformers which do not offer isolation. However the step-down transformer inside your consumer equipment is almost always isolated.
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