You may need a line conditioner that isolates the outlets.
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That's interesting - I use a MacBook Pro feeding an external DAC via USB, and I don't notice anything. I wonder if it's related to your power or if it's only an HDMI issue. Can you try USB and see if you have the same problem?
(btw - I had a pair of Meadowlark Kestrel Hot Rods in that system until last year. Great speakers. Looks like yours are even better now!)