If you are connecting an RSL subwoofer via it's speaker level inputs then the negative input terminal on the RSL is not a ground as it's a Class D amp. The way to resolve the hum is to connect a piece of wire from one of the screws on the amp to an alternative ground point. Those instructions for hook up are directly from Joe Rogers. When I had the same issue with a pair of Speedwoofers I just stripped a length of zip cord but any wire should work.
Amp or Subwoofer causing Hum?
Recently (after Beryl) I noticed a strong hum coming through the subwoofer. I changed cables still hum. I disconnected the subwoofer cable from the amp no hum. I turned the sub on but turned the amp off still a hum. I switched the center tube position still hum. No noticeable hum from speakers. Sub hooked up to carable out. Used y splitter and single rca outlet hum consistent with both .
any thoughts or suggestions on what to do or which item to have checked out first?
Rogue Cronus 2
Rsl subwoofer 10s mk1
Geshelli dac
wiim streamer
falcon Q7 speakers