Rob,
As Ramses notes...there are far greater influences upon SQ. Pick a Filter, and move forward. I Subtly like Sharp after careful comparison many months ago, rather than opting for a Filter chosen by Committee. Asking MC for his "Second Favorite" Filter? He's an Engineer. I don't think He has an emotional involvement with DAC Filters. What next? Favorite Pajamas? Favorite BedTime Story? Hot Chocolate? With or WITHOUT Mini-Marshmallows? It gets weird Rob...
As is covered in your User Manual, and Dozens of Posts in this Forum...SD Sharp is the default Filter because of its Low Latency (delay) This Low Latency is very advantageous in a Studio Monitoring application where there can be multiple Signal Streams to be monitored, but almost meaningless to the home listener who listens to just one. An analogy: Have you ever watched a YouTube Video where the Video and Audio aren't in Sync? That's an example of a form of Latency . Imagine now mixing a Recording where the individual tracks are each in a seemingly different time zone???
"Sharp" as many prefer, and "SD Sharp" as Many others (ie: Studios) prefer sound curiously alike...but vary in the way described earlier. Do the Reading!
It's not a Quality matter, but rather that Low Latency filters such as SD Sharp are simply more well suited to the Studio environment. What you prefer at home is "whatever"
Until you've done the Blind, Level-Matched, A/B/X comparisons you cannot possibly know the vanishly small "differences" in the Sound from one filter to the next. HiFi Magazine articles to the Contrary are merely propogating falsehoods. They're often quite expert at this!
So...
Vintage 2018 ADI-2 DAC. "Classic AKM4490 Edition"
Cables: Red, and White Ones.
Speakers: Yes