I plan to grab a JCAT FEMTO USB card, and install it in my OWC Mercury Helios 3 Thunderbolt 3 enclosure. I will be powering the enclosure, the JCAT card, and my new SU-6 with an HDPLEX linear power supply. Perhaps one day I'll replace the switch mode power supply in my 2018 Mac Mini with a linear one, if such a thing becomes available.
@Baten Thus far, I'm finding the SU-6 to be a big step up from the Amanero combo 384 in my R-28 – but then, perhaps that's not saying all that much, as that card isn't considered to be anywhere near the top of the heap. I just know that I'm getting more obvious clarity, transparency, and detail. The SU-6 certainly wasn't cheap, but I am otherwise completely blown away by how good this system sounds for the money (R-28 > Pair of Precision 3S [with MUSES 8920] > KEF Reference 102/2 [paid $150; have fancy new custom speakers with Scan Speak drivers coming in soon]).