SN3 and AV hum

I’m not sure what the safety experts here would say about ifi Gnd Defender but one of these has solved my ground/hum issues.

Ive just been through this the past week. I made a ground cable using some spare chord company odyssey 2 speaker cable (12gauge). I only used 1 of the wires and a UK plug. I only connected the Ground wire. I attached the wire to the signal ground screw of my Denon X6500H then plugged it into a spare socket of my power strip and all the buzzing/ humming has gone.

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