The problem still remains even with RCA cables connection, and it is more noticeable at high gain, so it seems my Can is poorly grounded, my Zen Dac alone does not have this problem, but there is nothing that affects the overall performance so I don't care about it any longer, and I didn't expect high-end quality from a cheap Chinese product in the first place either.Just recently one our customer reported back that he had that problem. It turned out that a 4.4mm cable that went in-between his ZEN DAC and ZEN CAN was faulty and didn't provide earth to the latter ZEN.
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