You say the noise goes away when you turn off the power to the preamp, even with the cables connected? If so, the cables would appear not to be generating any noise. Implicitly, the noise is coming from the preamp, or a source component that isn't playing but still selected by the preamp control, or some dysfunctional interaction between your preamp and the cable. Have you verified the correct wiring of the interconnect -- is the correct wire soldered to the correct contact/pin of each connector (RCA and XLR) as specified by the preamp and amp manufacturers? The connection conventions do vary in different regions of the world. If the cable is properly wired, I suggest you have your pre/processor checked out by a dealer or the manufacturer. Good luck.
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