Classic case of radio frequency interference. Moving the components around a little and changing the path of the cables may cure the problem. Check the archived posts. This type of question has been answered before.
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try powering off the amp, then disconnect the inputs & power it back on. Check for the RFI; if not present then reconnect the interconnects but now with the Rx powered off.
Repeat the test, power the Rx back on. You could also try some different interconnects - finding these problems is a simple process of elimination.