Hi guys, OK just clearing up a couple of technical points. All Gross DAC’s use the Amanero USB board & will continue to do so. I did purchase a Singxer F1 & spent quite a bit of time trying to make it work in a Gross but in the end gave up.   1. Not true pin for pin compatibility so owners could never just swap out the Amanero for the F1. 2. The F1 requires quite a bit of modifying to fully power it from a seperate low noise PSU like I do with the Amanero.