Stack Audio-SmoothLAN Network Filter- WOW!

The back to back Ethernet filters containing ferrites and caps are well established, so filtering on Ethernet lines is effective.

Conducted emissions are below 30MHz, above that frequency are your classic RF interference. I think you'd be unlucky for such a frequency to enter the copper bits of the Ethernet, the impedance is all wrong.

The case with the 20 screws can certainly keep the paths in, but won't radiate out. I wonder if plain Cat5 cable on the input 'will do' since screened Ethernet cables require a specific grounding scheme to be effective and ground loops are too common and difficult to solve. 

The supplied CAT7 would work since the shield in that cable connects directly to the SmoothLan filter, but beyond that to the source; maybe effective to remove the screen at the other end.

I've been using the DX ISO filters for some time cleaning up Ethernet, they work quite well and are half the price of the SmoothLan. Screened cables are not used in my network.

Still considering the SmoothLan, awaiting opinions from others.

The back to back Ethernet filters containing ferrites and caps are well established, so filtering on Ethernet lines is effective.

Well established to work by who? This it not IT networking, but audio. The ferrites not only will choke the signal by creating a magnetism effect, effecting not only the insulator and shield in the cable, but start to magnetise the connecting components. This is why no serious high end equipment uses ferrite chokes, only cheap stuff and the products by EE types who design by theory alone.

With all due respect, what audible effect ferrites have in an analog cable (signal or power) would not necessarily be consistent with how they may work with digital cables.

In the days of SDIF cables (and later USB), I noticed ferrite had the exact same effect as signal/power. And they are considered a digital signal, although possibly not the same type of digital signal as ethernet.

Another expensive filter , I just learned about

https://www.reikiaudio.com/

Thanks, Ozzy!  I have had the SmoothLan for a couple weeks and I believe different systems will see different results.  For me, it quieted the streamer so it now sounds smoother, more like an R2R.  I haven't noticed any difference in the soundstage, but the presentation seems less digital than before.

@agisthos, I apologise for the error in describing the back to back Ethernet filters.

The circuit of the Halo HFJ11-1G46E  Ethernet jack as found in the DEXE-ISO filter contains inductors, both air and iron core types, caps and resistors. They don't include ferrites.

The reason for the well established is how many of Ethernet RJ45 jacks contain noise suppression elements are available.