This thread is to discuss the merits or not of regenerating an accurate clock in ethernet feeds for music streaming.  The Uptone device seems to be leading the way and much has been written about it both here (positive):
audiophilestyle.com/ca/reviews/uptone-audio-etherregen-review-and-comparison-r887/

...and here (negative):
www.audiosciencereview.com/forum/index.php?threads/uptone-audio-etherregen-switch-review.10232/

Uptone Audio EtherREGEN - Listening Impressions

My system is as shown in my signature. The EtherREGEN is inserted between my TP-Link 4G router and the Asus Tinker Board S single board computer running Volumio. The feed into the A side is via an Acoustic Revive RLI-1 LAN isolator and 3m MeiCord ethernet cable. The feed from the B side is via a very short 12cm Cat6 link cable.

The EtherREGEN is powered from a Chinese 12V 50VA linear power supply via an MCRU PC-OCC carbon loaded shielded DC cable. It sits on two Black Ravioli Pads and there is a granite coaster on top. A Black Ravioli Eflos grounding box is connected to the spade terminal.

Burn-in
At first listen, from brand new and stone cold, there was not much difference that I could ascertain. Things were left to warm up and burn in. The ER runs warm but not too hot to touch, even with the coaster on top, which rapidly comes to the same temperature.

After 24 hours, I swapped the short B side SFTP Cat6 link for an unshielded Cat6 and there was an immediate lessening of the slight hardness I could hear. This was probably connecting the chassis of the ER and Asus together, defeating the moat. Everything was smoother yet still detailed and dynamic.

After 48 hours, I swapped the stock SMPS for the LPSU. I could hear the LPSU immediately respond to a Cleanwave from the P3. I was rewarded with a darker background, more vivid contrasts, greater depth and authority. This was most likely due to the effect of removing the SMPS from my regenerator, the rest of the system using ultra-quiet power supplies.

After 60 hours, I added the Black Ravioli Eflos grounding box to the ground terminal. This gave an even lower noise floor, more rear stage detail, deeper soundstage. Greater impact. There is considerably more depth, reverb and decay. It sounds very vinyl-like but without the downsides.

Listening Impressions
This is after 100 hours of continuous music through the ER. I noted the enhanced fine detail in the opening to Lou Reed – Walk on the Wild Side, followed by the change in quality of the faded in female backing singers later on. Listening to Anna Ternheim – Bow Your Head, the mandolin throughout the song is startling in its tone, string sound and vividness. There is tremendous immediacy and impact in Joan Armatrading – Willow, as well as the reverb on the drum, a quite stunning song recorded back in 1977. The opening atmosphere in two Juliette Commagere songs The Big Middle and Plantsong are both notable.

The drive, impact and sheer intensity, not to mention the huge dynamic range of Alt-J – Dissolve Me. From thunderous synth chords to near silence and back again, the stage behind solo voice could be clearly heard. Rick Wakeman – White Rock has a very busy mix that can sound murky on lesser systems. Every strand is revealed, the bass kept tight throughout and his finger dexterity on the keyboard showcased.

There is amazing reverb down to silence on Mimi Parker’s voice in Low – Lullaby. Plastic Cup, another Low song, also features the incredible sound of Mimi's voice, made to sound more dimensional and real. In Massive Attack – Angel, the soundstage atmosphere at the opening brings out the foreground beat more starkly, again deep bass remaining as tight as ever. Finally, Van Morrison – Into the Mystic, has a delicate acoustic guitar in the opening against a gentle backdrop, everything beautifully placed in the soundstage and far clearer than I’ve ever heard it before.

Conclusions
The ER, in my system, lowers the system noise floor and brings out soundstage, depth and fine detail to a notable degree. By enhancing the contrast between foreground instruments and the sound of the recording space, dynamics if anything are made even starker. Very deep subsonic bass comes across with greater texture.

The addition of an LPSU and a grounding box both released even more performance from the ER.

Double reclocking (ethernet and S/PDIF) benefits are additive.

I didn't even touch classical but I've been listening to a lot, too. The ER works very well for big acoustic recordings and as for Chistina Pluhar, utter magic!

Amusing to read the comments in Audiogon about the ER. You have the ones who own one, mostly very positive about its effects with only one person I saw who had returned it. Then you have the opposite camp, who 'know' an Ethernet switch can't make a difference and keep trying to tell the other side that they're wrong. Needless to say, not one of them has stated that they have actually tried one.

Jeez, just listen to the music, people!

So, now that you've regenerated every possible thing, and absolutely nothing of the original signal is sullying your system, what's next, Martin? 

Of all the music I've so far put through the system with the EtherREGEN in circuit, the album that gains the most (not the best sound quality, but the biggest leap upwards) is...

Hawkwind - Space Ritual
This is the Qobuz 24/48 Edition StudioMasters

I kid you not! I'm listening to it now at some volume (no LSD required) and it is quite fabulous. Vivid, live and raw with some real dynamic contrasts. Not so much an improvement, more as if it had been re-recorded with some decent gear. It's not all the remastering, by any means, it was still soupy and opaque on previous listens. I am truly impressed.

Full review...

www.theabsolutesound.com/articles/uptone-audio-etherregen-ethernet-switch

Here are some really interesting data and measurements of, among other switches, the EtherREGEN. Fascinating comparisons of the A side ports and the B side using different power supplies and internal/external clock.

You will need to invoke your browser translator.

www.open-end-music.com/forum/privatforen/thomas-michael-rudolph-tmr/651284-messungen-von-ethernet-infrastruktur-nur-lesen/page3

Happily, and co-incidentally, the ER performs very well with the Zero Zone power supply using a mains filter (I use mine with a regenerator). They find that an external clock does not improve performance, but they are using a clock of possibly dubious provenance. To my ears, the ER hugely benefits from the external AfterDark King clock I use with it.

It makes for excellent reading.

I made a flippant comment in another post about why on earth they didn't use a larger box with decent heat dissipation built in. Another complaint is that the connectors could be better, especially the DC in socket. I have just wasted an hour trying to figure out why the network between the EtherREGEN and the streamer had been lost. My new 75 Ohm cable arrived and I only bought one 0.5 m long (why I do not know!) which meant it would be easier to have the B port facing the rear. Having moved things and re-cabled everything of course it didn't work and I could not see the lights on the EtherREGEN to see what was going on. So I turned it around and found the the network connection was intermittent. The cable to the streamer tested fine, but it is CAT 7 and quite heavy. I switched it out and still got no connection. However, in doing so I dislodged the DC in and reconnected it. After it had rebooted the connection was restored (I had already tried power cycling the unit a few times and made and broken the power connections). Switching back to the CAT 7 also worked.

It seems that the power connection is a bit flaky (this was a new unit from Uptone with their UltraCAP PSU and lead) and, even though the light on the EtherREGEN is green, it seems that this may not indicate that the connection is good. Maybe it just doesn't quite get enough current to power the ethernet port or internal circuits somehow. I wonder if there in enough room to install a locking connector rather the the current one? Or maybe it is possible to rehouse the whole shebang in a decent case!