What cable did you use?  

Ok thanks for all the responses. That's really disappointing. I will try a few different USB hubs and see how I go. If its just a case of needing a hub I can deal with that but it doesn't sound like it will unless the PC port supports the input.

So I have trawled the net and this forum and am just wondering if someone can answer for the question around the USB 3 DAC support. I have a new Macbook Pro.. two weeks old. I cannot get any sound out of the AK120. It shows up as a device on the Mac and seems to allow music to it but no sound in...