Just wanted to give people a heads up just in case they find themselves in the same position as me.   I use the C658 as a DAC only and don't use the Pre / variable volume function. So I set the fixed volume on the C658 at the default which is 0db.   Problem was at this level there was distortion to the point where I thought the unit was faulty.   Before I did too much more I contacted resident expert @furtherpale and turns out there are two settings that have to be
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