I probably can't help you with your specific issue but I, too, am using the HT bypass (on the PL DP preamp). I experience a low-level buzz which is considerably louder in HT bypass mode than in, for example, CD input mode (when I am listening to music). Frustrating. I've called PrimaLuna and, after much experimenting, we weren't able to figure it out...but they are apparently looking into it. Good luck resolving your issue.
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