Hi, at first sorry for my English, assisted by google translator. I have a problem with smsl su9. I used it for 2 days and it worked fine. Yesterday my macbook stopped detecting su9 via usb as output. I also checked Gustard x16 and my mac recognizes it correctly so I'm afraid the problem is on the su9 side. I connected su9 with another computer with windows and it does not detect it either, although the su9 display in both cases shows connected after connecting but the system does not see the dac as an output. Maybe someone had a similar problem and managed to solve it?