I am using a unpowered Sablon Audio Reserva Elite USB cable between my Lumin U1 and Lampizator Big 7 for the last 2 weeks. I have never enjoyed my music more.
I've got mine back after the latest 2017 elite upgrade since a few weeks (use it between a modified dual pc setup and a Lampi GG). Amazing how low the noisefloor is with this cable and quite the upgrade from the previous version. In the past I used the PPA Studio top model, which was a big improvement above the AudioQuest Diamond which I had on loan.