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[rghanbari]

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)

[rghanbari]

As a quick update, I was able to do a test on my DAC cable between my audio router and my streamer, using 3 x Würth 74271142, 2 x Würth 74271142s , and 1 x Würth 74271111S (parts for the v3 throttle cable, while I wait for the rest of the parts)

The impact was definitely audible, but not a game changer.  There is some benefit to be had here for sure (alas, cable is too stiff to wind around the torroids

I suspect 5-8x Wurth 74271633S could be beneficial here, but that experiment is for the future

Eric, for the v3 throttle cable, what was the rationale for the ferrites that you chose?  The 74271633S pushes into higher frequency ranges, and there are other Wurth ferrites with higher impedance in that 70MHz range.

Alas, there are so many ferrites to chose from (and combinations with different impedance match and mismatch to consider), I’m curious about how amenable the filtering choices are to a data driven approach

[Autor]

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