Background noise level when idle

[mdconnelly]

Does the volume of the noise increase if you turn up the volume of your Devialet? If not, it’s not likely tied to any inputs to your Expert Pro. It might be RFI/EMI interference getting picked up from other equipment nearby. Leave the Devialet on (while it’s making this sound) and start turning off other nearby equipment. You may also find it coming from a light dimmer switch or a fluorescent bulb going bad (this last one happened to me when I discovered an outside flourescent flood light was the cause - took me forever to track it down).