What ethernet wire are you using?
Wire above 6a should have a ground wire, which should help with noise. Though your equipment should allow it to be effective.
B
Need Wired Ethernet Access but Noisy Extender
Current setup - Roon core on Mac mini in other room - microRendu fed by Wi-Fi extender’s wired ethernet cable into Denafrips Terminator ii. Finding it noisy with the extender on the same circuit as my rig. I don’t have the option to run ethernet from my router directly. Am I out of options? Or is there an alternative? Linear power supply for extender?