In my set up the faint click sound is heard from the Diablo itself. But not in my speakers.
As I understand it the "clicking" is a result of how they have constructed the volume control. The goal is to have one that have as little effect on the SQ as possible.
Here is what Gryphon say on their web site:
"Unlike the vast majority of solid state volume controls that typically introduce dozens of resistors in the signal path, the Diablo 300 employs no more than two for any given level setting."
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