Help with Hum on a Yamaha YST-SW45

Satman17

Novice Member
I’m using a Yamaha YST-SW45 subwoofer on my DENON AVR-1905 AV Surround receiver but I have a problem.
The subwoofer gives a hum which I cannot get rid of the subwoofer if connected to the ‘R’ phono connection as per instructions but the problem is there and annoying

Any help would be great

thank you
 

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