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RE: Common Mode Noise

Yep.
This or that filter at the right spot can have quite an impact.
However. There are cases (too much filtering) where things get worse!
Again - interesting to see that your insanely high priced gear is
not able to cope with it.

Advise related to your photo:
First u should cleanup your under-the-hood cable mess.
That mess acts like antennas and might cause other interferences.

Keep mains separated from DC and NF signal cables.
And also keep HF stuff like network and USB cables separated from the rest.
And review your grounding scheme. Proper grounding is key!

Hint:
U could e.g. cut and fold cardboard chunks to act as cable bridges
and cable runs.

Another hint:
Keep the DC cables as short as possible!

And also keep in mind that additional jacks and plugs cause issues
on their own.


Good luck


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