Hum noise on my Adam A8x. Noise inducted by computer, its hear even when mouse moving but its especially very loud when start 3D game (video gpu start working).
In my case im found solution - speaker must be powered but another power outlet (wallplate) then computer.
upd: in my system also work just use XLR (balanced) cables with DISCONNECTED RCA cable. But, of course, to do that you need prof audio interface with balanced output.
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