Your experience is interesting and it seems you are willing to try many possibilities.
I have heard many good things about the ENO, Melco, EtherRegen, SoTM and other things you have tried. I have tried many things too, but different to you. I have some suggestions.
I have had excellent results with wifi, despite the stigma that it should be avoided. It seems to me, the ‘noise’ being transmitted via wired ethernet is possibly more problematic than wifi and some manufacturers have optimised that.
Given you have an ENO on your TV, try disconnecting it and connecting to the TV via wifi and see if there is any difference.
Moving onto your Devialet Pro. I have 440 Pro and so far I have found the best connection to it by far is via wifi. But that is assuming the Core Infinity is the roon endpoint (I use Antipodes EX as server/roon core). The only things connected to my my Devialets are power cords, speaker cables, and ground to Synergistic Research Active Ground Block SE. My results may be because my network is also very low noise and jitter as follows.
ISP device > Cat 6a UTP > EtherRegen > fibre > Mikrotik CRS 305 (router) > Cable 1 > EX > Cable 2 > WAP — wifi — Devalet
Cable 1 = Synergsitic Research Atmonshpete X Reference ground via HD ground wire
Cable 2 = Shunyata Sigma
WAP = Mikrotik mAP lite powered by lithium battery.
Every tweak I make to the network is still audible despite ER, fibre and wifi isolations and carefully selected cable shield terminations.
It would be interesting to compare:
- K50 via AES to Devialet (ie. K50 reclocked output)
- K50 via ethernet to Wifi access point to Devialet (K50 as server, Devialet as player)
Essentially this is comparing:
- the benefits of the K50 player and reclocker and
- the benefit of totally isolated signal to Devialet and one less source of noise input into the Devialet.
As an alternative to 2, it would be worth trying toslink from K50 to Devialet.
It is puzzling why, when there is plenty of experience that ethernet transmits noise (eg. the emergence of products like ENO and Waversa LAN Isolator to combat it), that Antipodes has not incorporated fibre SFP or wifi into its machines.