The Optilink Pro 2 is very good, and if the AT&T is well executed will usually out-perform any coax in my experience. But, leaving the coax connected is potentially a bad move as you are leaving an earth link between the two. If you remove the coax, you will probably hear an improvement in the sound of the AT&T connection. All of this stuff about digital interconnects is dependant on where the manufacturer has placed the most effor in the equipment, and some people prefer coax just because the earth noise adds warmth.
Digital Interconnect
I read a recent thread where several people stated that coax was better than AT&T for digital transmission.I currently run AQ Optilink 2 between Krell MD 10 transport and Theta Pro Generation 3. Anyone familiar with this set up and have opinions on a better digital cable for these components.Even opinions on the Krell /Theta gear is welcome.Thanks