[diver110]

Well, if you ever figure out why, please let us know.

PS Two things I have heard in the interim is that the SP1000 has better audio isolation and the Fios optical out is said not to be that great. I suppose when you use the top of the line DAP, it makes some sense that the total quality involved could have a positive effect on the sound, though I don't know if it is worth the money....