Are there any issues with competing noise reduction systems if one already has a power conditioner in place?
No.
The folks over at thecableco.com recommend the non-NR versions of the Shunyata if one has a power conditioner. Just curious if others have tried both versions.
The folks at thecableco.com have got it, er, um, a bit...inaccurately.
Getting back to a basic premise which we need always keep foremost in our minds is that this is AC...alternating current. Which goes
both ways....INTO the system components' power supplies and...OUT of the system components' power supplies.
From an article Caelin wrote a while back:
"A primary source of audible sonic degradation is caused by the power supplies in our audio/video components. Most components use FWBR (full wave bridge rectifier) power supplies that generate an incredible amount of transient noise when the rectifiers switch off. The design of a power cable can significantly affect the reactance of these signals within the power supply. The power cable is effectively part of the primary winding of the power transformer. The transition between the various metals used in a power cable and its connectors can cause electromagnetic reflections and diode-like rectification of the noise impulses as they propagate away from the power supply. If the power cable presents a high impedance to these signals they will be reflected back into the power supply where they will intermodulate, thus increasing the high frequency noise levels of the component. Most power supply filters are ineffective at blocking very high frequency noise components and much of it is passed through to the DC rails. The sonic effects of this include: high background noise levels, blurred or slurred transients and a general lack of clarity and purity of the sound or visual image.”
The power distributor's internal noise reduction system is to mitigate noise (e.g. RFI, EMI, and leakage, etc.) from entering the overall system components from the AC "mains"...i.e, going into the components power supplies. The function of the NR power cord is to keep noise from the bridge rectifier power supplies from going
back out from the components to the other system components. This is why the noise reduction filter for the NR power cord is built into the IEC plug end..near the component, because it works most effectively when it is as close as possible to the component's internal power supply.
The non-NR power cords, e.g. the Shunya Omega, Sigma, Alpha, Delta XC, etc. power cords are intended for connecting
power distributors (PD) to the AC mains because these power cords are specifically designed to deliver as much
current to the PD as possible, which is what you want in a PC that is connected from the AC mains to the PD (in other words, these PCs don't need NR because the PD they are connected to provides that).
If you're connecting from the wall receptable directly to a say, an amp, then you want to use a NR power cord in this application, because there is no NR-capable PD to provide NR filtering coming in from the AC mains.
The other place to use an XC PC is with a product e.g. the First Sound preamps, which have external power supplies with Shunyata CCI-X NR tech already built into the input end (AC end) of the power supply, so you don't need to use a NR power cord here because it's already "built in".