You don't mention where the humming is coming from but I suspect the transformer. Have you tried to see if may be loose from the pc board. Also it may be a grounding problem. Do you use a pwr conditioner and if so what might be on the same line. Some gear may always have a little hum to it. As you mentioned you only hear it when all is quiet. My SonicFrontiers dac has a slight hum also but I have added a vpi brick over the xformer which seems to do the trick. This may be something you may want to look at. Best of luck and Happy NewYear.
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