As you can see the measured noise on the graph in the above link I posted, is incredibly low well below -150db, the only two noise peaks are at 100hz and 200hz which are mains related, and is apparently eliminated with the even better optional up-rated power supply which Edgar got after the review went to press.
Ā http://www.6moons.com/audioreviews2/totaldac5/5.jpg
Cheers GeorgeĀ Ā