2. Have you done any research concerning jitter in digital cables?
3. Do you know the difference between adaptive mode and asynchronous mode in usb?
4. Do you think perhaps that a usb to spdif converter works similarly to a hard drive?
If your goal is just to drag this thread off top track and start another cable believer vs. non believers pointless discussion, please stop here.
If however, your intent is to learn or provide a useful insight; I invite to read Dan Lavry's posts on jitter and reflections in digital cables (the same rule apply to usb cables when they are used in the adaptive mode). I also invite you to read Stereophiles article and jitter measurement on digital cables (Stereophile: A Transport of Delight: CD Transport Jitter).
Of course, you could argue that those jitter numbers are below the threshold audibility of human hearing. But such a discussion is better suited for the sound science forum. Please read this : http://www.head-fi.org/forums/f46/do...-forum-450574/