XLR to RCA – If you are converting the Preamp XLR output to NuForce RCA input (Reference

, make sure that your XLR to RCA connector is wired correctly (even if you purchase off-the-shelf XLR->RCA connector, there is no guarantee that it is properly wired):
Pins on XLR are 1-ground, 2-hot, 3-cold (easy to remember), and when patch to RCA, it should be:
Pin-1 = RCA ground
Pin-2 = RCA center pin (+ve)
Pin 3 = no connect
Chassis pin = no connect
If the XLR adapter erroneously tied Pin 1 to chassis pin, there will be a ground loop, as Ref 8 chassis ground is wired to the ground on the AC cord = chassis ground on the preamp. But this is NOT EQUAL to the signal ground on Ref 8. It will basically short our RCA ground to our chassis (via a long loop through the preamp and preamp's AC cord, wall AC socket, and Ref 8 AC cord).
For other people who're using Ref 8b in their system, having truely balanced connections THROUGHOUT the whole system is important. Check with your equipment vendors (preamp, phono etc) about their balance connections.
Check out the support page on NuForce website.
This is a good article:
http://www.rane.com/note151.html