Just an update from February with this inexpensive approach. I had been looking around and examining 5v linear power supplies. Finally pulled the trigger on a unit by Solupeak.
So of the two media converters with the fiber connectors, I have one on the "dirty side" as they call it. Result?
Astounding, simply astounding. I was hoping to see a little improvement but once again, it just made me regret not doing it sooner.
Again, my system is unique but consists of 65w tube monoblocks, RME ADI-2 DAC, McIntosh LS340 speakers, using a 2011 Mac Mini running Audirvana's Studio software.
The depth of the sound, the separation and black space all take another major leap. I'll add that my setup is especially sensitive to changes, even a small tube can offer some nice change/improvement.
Also running a LPS on the RME DAC. That was very nice but this is more than I could have imagined. It's going to be a spell digesting this one.
Thanks again to @sns and @romney80 as this is a superlative low investment for big bang results. Thanks to everyone else who also shared their experience.