Connecting a unbalanced output preamp to Krell FPB350 balanced amp

Hello everyone,

I own a Conrad Johnson 17LS and a pair of Krell FPB350 amps. The CJ has only RCA unbalanced outputs and the Krell has balanced inputs (either in their proprietary CAST configuration or a standard XLR connection). I've been trying to upgrade my interconnects and have been experiencing buzz and hum. I was wondering if anyone has a cable configuration that best minimises these problems. I have seen the "rane.com" suggestions and tried their configuration #17. I've tried other configurations such as 3 cores with a shield that is connected at the XLR end to ground and the RCA end to the return conductor/pin. I've also tried with only one end (XLR balanced end) connected to ground. None of these solved the problem though the second option above seems to have the least amount of hum or buzz.

Regards.