I have a question concerning E7/E9 obtain my latest combo to exertion. I've not at all had an amp before, and pay money for the e7/e9 based on one of the comments I've seen, which spoke pretty extremely of it. Before buying, I did some looking around and it seemed that many users were using different operating systems (Windows, Mac, and Linux). However, I am having a number of troubles to work within USB mode DAC. When I use it in the normal way during mode among an MP3 player, everything works fine. But when I utilize the USB DAC, I have troubles in particular there is no sound.