With regard to comment about unsatisfactory sound from the PS Audio PWD, I had a similar concern when I first got the PWT/PWD combo about a year ago. The digital volume control became the focus of my concern when I learned that this type of control must discard information in order to lower volume which explained the increasingly flater sound as I turned the volume down. I immediately bought a Pass Labs X 0.2 three piece chasis preamp. This made a phenomenal difference in the quality of the sound emanating from my Martin Logan Vantage speakers. This was the real thing for me; now, the PWT/PWD combo and the X 0.2 are keepers.