I own a modified dx7 pro topping with OP Muses, a Gustrard x26 Pro and this week comes the MUSETC MH DA500.
I will perform blind listening tests by connecting them via SUPRA USB2 0.7m cable to a mcintosh mc152 amplifier via OEHLBACH XXL XLR 0.5m cable and to B&W 804 D3 speakers via QED Genesis Silver Spiral 1.5m cable.
I’ve never had a need for measurements or for blind testing to figure out if a component should stay. Does it sound like live, unamplified, music in real space, and more so than what it replaces? That’s all I want to know.
I suspect that you won’t need a "blind test" to know what you have when you turn on the Musetec with a bit of warm-up, even though not really broken in.
But I worry about the Supra USB cable. It is one of the few that I have tried and it is really opaque. When I try the Supra I have to raise the volume considerably to hear low level stuff. A low cost cable I have recommended is AudioQuest Pearl. It’s a simple solid core copper. You also won’t need a blind test to know it’s better. It’s not the best cable I’ve used but it’s pretty good and somewhere near the Supra price category, perhaps even less. However if you’ve been using the Supra for a while I suppose you should leave it on so that the difference will be the DACs and not the cable.
You haven’t, though, told us what’s at the other end of your USB cable. Also, no preamplifier? Are you using digital volume on your DACs?