I do not have the first problem, but I get the same speaker hum in my system - NUC to Integra DTR-8.9 via either HDMI or DisplayPort. It appears that the hum only occurs when some video is changing (e.g., moving mouse, scrolling web pages, or even when the update ticker at the bottom of this page changes). This is a huge problem since I use my NUC as an HTPC, as I'm sure many other users do as well. If this does not get fixed, I will have to return the unit and go a different direction.
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