I just read thru posts since post 137 and have a few comments, not aiming at anyone in particular.
Firstly, the quest couid be never ending, so when you find a happy place in your journey, stay a while and enjoy it, reflect. You might be quite content there because you’re not obsessing over improvements.
Next, my experience is everything in the network matters when it comes to audio quality. And I mean every cable and device enroute from where internet enters to the hifi endpoint.
Priority order:
Power
Cables
Ground
Devices
With devices, use 10G or good audiophile devices if you can for the backbone from internet to hifi. Push everything else off that backbone ideally isolating from the backbone with fibre to other switches. Focus on reducing impacts of ‘noise’ on the backbone power, devices and cabling.
Ground everything best you can.
Fibre done poorly is ok but not optimal. Done properly is best performance per $ over a 2 meters or more. I use fibre for a long leg (10m). And I also use wifi to my Devialet (streamer);
much less noise than any expensive wired connection I tried!
A wired connection is a necessary evil for most situations. But use it sparingly and choose excellent cables. Where you must use wire, choose wisely. Because despite my fibre and wifi, changes are still obvious further upstream. To illustrate, here is what I did recently …
I have grounded the fibre internet service device and the EtherRegen immediately downstream of that, and gained improvements that were obvious to me. Also note these are on different AC circuit than the router, server and endpoint.
The ground I did was via Synergistic Research ground cables and passive Ground Block. It was initially just plugged into an AC outlet, but gained another improvement when plugged into the ground terminal of an ifi AC purifier.
In addition to doing the above, I have installed Synergistic Research Atmosphere X Reference cable from the internet service device to my 1st switch which is the EtherRegen acting as FMC (including HD ground wire from the cable to the ground block) … as per bold here
Internet > cable > ER > fibre > Mikrotik CRS 305 (router) > cable > Antipodes EX (server) > cable > wifi access point > Devialet Pro (player/streamer)
A quite obvious improvement. I didnt realise how much more could be gained even in that location.
The gains I have made from these fundamentals are, altogether, staggering.
Add to that a very nice tip of converting native PCM to DSD 64 to PCM 192 = happy place presently.
When I have exhausted reasonable optimisation of these fundamentals, I may consider upgrading the EX.
I hope this is helpful.