<p style="text-align: center;">Hoi Wijnand, I was curious of course and it seemed you made big progress! I admire your perseverance, you are (always?) on fire! Also  a picture(s) is worth a thousend words, thanks!</p>
Thanks also to Tobias for your input. Do you know if the double ferrit cage, as built by Wijnand, is based on the Muon pro or the previous filter? In what does the Muon pro differ?
And what would be so special about the Network Acoustics noise rejecting cable design? I know Wijnand not to be convinced (any more) about higher end Ethernet cables but it seems NA and Eric (the sound of ethernet) found a beneficial synergy when using a passive filter WITH a special ethernet cable.
Wijnand, how much I wish you could replace the switch with a clocked and LPS powered EtherRegen to find a difference in SQ.

Thank you both for sharing!

As they say, it is really remarkable that this is not known broadly, in an ethernet context, when you think about how simple it is.

That ferrit core ring is amazingly efficient when paired with a non shielded ethernet cable, it seems.

I have no insight in the Muon at all but it makes sense to me that passive filtering should be used the last bit into the streamer, when you realize how incredible sensitive the DAC is for this noise. Any electronics or power supplies will result in noise, regardless of how expensive they are.

<span style="color: #000000; font-family: Verdana, BlinkMacSystemFont, -apple-system, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif; font-size: 15px;">''this is not known broadly''</span>

Agreed it's not common knowledge, but I think we really need to unpack how passive filtering works. There are so many variables at play, especially when it comes to those ferrite cores. Eric, NA, and now Wijnand each have their own methods, and they're all seeing impressive results in their setups. ENO and MUON pro have caught the attention of quite a few audiophiles too.

Why stick with just single or double cores when we could experiment with triple, right?

And there's a whole bunch to consider with the type of cores, their sizes, and thickness. Plus, the number of windings is crucial. Just one extra winding can completely change how frequencies are affected.

And what about those Cat5 cables? Do we wrap all the wires or just certain ones around the ferrite?

It seems like using a passive filter with a special isolated Cat5 cable just makes the sound quality even better.

And then where's the best place to put that filter and cable combo?

Not sure if you saw it but here is Eric´s favorite choke cable right now and it should be the last step into the streamer:

2m SLIM SL6A + 1 x Würth 74271111 + KEMET ESD-R-613325H-NC23 (8-fold winding) + 4 x Würth 74271222S (3-fold winding)

The real challenge lies in identifying the common denominator among these setups. It's about figuring out what elements in what configuration consistently contribute to better sound quality across different configurations. That's where the real magic happens. Like the 8 windings possibly? I am out of time but I look forward to give it a try when I can.  Thanks for sharing.