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RE: Ordered some..will see (nt)

Hi TanteJuut,

A typical unshielded zip cord or twisted pair DC umbilical can attract RFI and is vulnerable to EMI due to the inductance of the conductors. The self-shielding aspect of the cross-connected star quad geometry helps to control the magnetic fields and lowers inductance considerably, as well as providing substantially better noise cancellation of RFI that rides on the DC umbilical. A DC umbilical with a braided shield can also be beneficial, with the most critical DC umbilical of all in my collection being a shielded design. The additional capacitance might even be of some benefit in terms of noise reduction.

Unless I'm completely unaware of the difference between a DC umbilical and internal DC wiring, AC is not an issue to consider any more than AC is something to be concerned about in terms of the internal wiring of a power supply section of an audio component without an external power supply. There is no metal enclosure to shield an external DC umbilical vs. internal DC wiring, and any internal wiring is in fact more prone to AC noise than a DC umbilical, as internal signal wiring often needs to be shielded with a braided shield unless a listener enjoys the sound of horrific hum produced by the adjacent power supply section located within the enclosure.

If any articles or reports are found that support the notion of AC otherwise affecting a DC umbilical, I'd be pleased to know any links to them.

Cheers, Duster

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