[Puma Cat]

The Shunyata Research Sigma XC power cord is part of the new Reference Series NR v2/XC power cords.

From Shunyata:
"Shunyata Research’s new Reference NR & XC Series power cords were developed using the same materials science and technologies that make the Omega QR the market’s ultimate cost-no-object power cord.

All Reference Series models are priced to be accessible for a range of budgets.

Using proprietary conductors and parts developed for the Omega QR — the Reference NR & XC Series deliver pace-setting performance in each product category."

Some folks may wonder about the differences between the new XC and new NR power cords (PCs).

The XC series was designed to provide maximal current as instantaneously as possible (DTCD) for power distributors. DTCD is the no. 1 requirement for power cords powering power distributors. It does not have noise reducion.

The purpose of the NR series of power cords is to power components, and to prevent noise from inside the power supplies of the amplification or source components, from coming back out, only to be re-distributed within the power conditioner to other componentry. This is why the NR filter is at the component end of the power cord; to reduce the noise at its source. This provides another level of component-to-component noise isolation.

As the power distributor is not an amplification or source component with a power supply, it does not require an NR power cord. This is the application that the XC was designed for.

The NR series of power cords were also designed to provide NR for components that may be plugged straight into the wall, e.g. monoblocks, that may be located near speakers, and may not be close enough to connect to a noise reducing power distributor in an audio rack.