I've recently installed a DAC64 into my hi-fi system and am very pleased with the increase in sound quality. However the DAC has a nasty habbit of clicking off and quickly back on when the thermostat in my fridge switches on and off. The problem is extremely annoying as the thermostat switches every quarter of an hour or so. I contacted Chord who advised I use an optical cable as this would isolate the audio signal from electrical interference - good advice but my CD transport is only fitted with one digital output which is an RCA coax electrical socket. Does anyone know how I might cure the problem as it's spoiling my enjoyment of music to such an extent that I shall be forced to sell the DAC if it cannot be remedied.