Noise from loudspeaker via Line-in source

[markush]

I would guess the noise is more prominent with the Marantz off as the output from it is not terminated with active electronics. So you'd get silence when you remove the cables from Devialet (or the Marantz...). What is the noise like with the Marantz on?
If this is a ground loop you'd need an isolation transformer between the Marantz and Devialet to create galvanic isolation.

Yes it’s absolutely silent when I disconnect cables on Devialet.
Noise when Marantz is turned on is about