@thelefthand yes, Z1ES USB Audio output from Z1ES was improved with the latest firmware, but the bass is a bit loose compared to tighter bass and better slam when playing SA-10 from discs or USB drive.
I also have Intel NUC7i5 with China-made (Zerozone) 19V 100W linear power supply; with optimized Windows 10 and HYSOLID and also Linux-based Euphony Audio (trial version) and USB Audio into SA-10, it sounds pretty close to SA-10 playing discs and USB drive.
I also have Intel NUC7i5 with China-made (Zerozone) 19V 100W linear power supply; with optimized Windows 10 and HYSOLID and also Linux-based Euphony Audio (trial version) and USB Audio into SA-10, it sounds pretty close to SA-10 playing discs and USB drive.