I notice that iFi has finally delivered their iPower universal audiophile wall-wart in the 12v version. I just ordered one from MusicDirect.
I’ve got a Roku 2 in my system for TV, and will be curious to see if this makes a noticeable difference there. If nothing else, perhaps it will put less noise on the power line than the cheapie that Roku supplies.
I’ve also got a Roku 4 on the way, ordered mainly because it has optical audio out separate from the HDMI, so I can eliminate my HDMI/optical-audio splitter and its wall-wart.
With luck, the combination of these two changes have potential to reduce the amount of powerline noise that both the DSD and the Roku see.