Neil Muncy has shown that audio frequency current flowing on the shield of balanced audio wiring will be converted to differential mode voltage by any imbalance in the transfer impedance of cables, and hypothesized that the effect increases linearly with frequency. Whitlock has shown that conversion also occurs with capacitive imbalance. This paper confirms Muncy`s hypothesis, and shows that shield current induced noise can be significant in the MHz range.
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https://aes2.org/publications/elibrary-page/?id=12594
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