Thank you Eric. I have a 2m DAC cable that I will be experimenting with (maybe 15cm diameter is the tightest you can wind it, so no easy looping)
From previous experiments, there was a big benefit here in reducing power impulses from the NIC side (lower power consumption by the SFP, more network isolation to reduce packet volumes, look ahead caching of files to concentrate traffic -> better the sound quality).
My presumption there is some induced noise on the power or ground plane at the transceivers, and the Taiko preference for direct attach networking is related to that, but that is all speculation
That being said, I clearly (and unambiguously) hear the benefit of of common-mode noise reductions using the techniques you’ve detailed here. These seem to be complementary (and perhaps competing) optimization levers
Like Jawed, I was very active with trying to optimize digital transport with Chord DACs back in the day (ferrites on BNC cables, optical transceivers for isolation, shielding experiments, power optimizations, etc) I am getting a sense of deja vu with these discussions and experiences with ethernet, which is very interesting (see https://www.head-fi.org/showcase/audiowise-opto%E2%80%A2dx-optical-isolation-bridge-for-dual-spdif.23757/reviews#review-22155 for some experiences from 2019…I had forgotten about those Chromecast experiments!)
(with apologies again for intruding with English on this forum)