The ideal solution for this application is the Photon AMP cable from Harmonic Technology (formerly Cyberlight). This presents a load to the pre of about 12" of interconnect and since the audio signal is converted to light and back to audio, there is ZERO chance of any ground noise or hum. Not a cheap solution to be sure, but an excellent one. Check with Mark at Rogue - they showed with HT Cyberlight cables at CES a couple of years back. Good Luck!