The solution - don't use high-end designer Ethernet cables.
There was an example here in Audio Asylum. Inmate switched to cheapie CAT5 patch cord. No more ground loop hum
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This Post Has Been Edited by the Author
In Reply to: RE: grounding and isolation posted by Leo loves music on April 24, 2025 at 17:55:22
In the case of Ethernet ports on networking gear they all have small isolation transformers onboard so the idea of ground isolating Ethernet is kind of a waste. But audiophiles have found ways to mess that up with high-end shielded Ethernet cables with metal RJ45 connectors at each end. These have the cable's outer shield terminated at the metal connector body at both ends of the cable. Perfect scenario for creating ground loops.
The solution - don't use high-end designer Ethernet cables.
There was an example here in Audio Asylum. Inmate switched to cheapie CAT5 patch cord. No more ground loop hum
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