The X1, from an authorized dealer only comes with the included PSU…I dont think its available without it?
Stereo and phantom center HT is how I roll…Its a shared space. Currently, everything inputs into the Diablo 120 dac via toslink or USB. With the X1, the analog output will favor stereo listening (while still keeping USB if and when needed). HT will also remain toslink into the Diablo dac all controlled with the same remote.
Btw, if you have a special (non-streaming) dac, the U1 is really stellar.