Answers to Rattle and Zachik.
The LP DAC uses an AK4499 4ch Chip. It will, obviously, be balanced with the expected complement of ins and outs. It will also, obviously, be in the same type enclosure for stacking.
As for LAuX and DAC output, I think this is a real estate issue. The rear panel is pretty much consumed with all the jacking that is there now.
And, LP without a DAC, there is simply no room to put one in because of the tubes and the needed tube supplies. The LAuX, OTOH, has the room for a fairly big daughter board that holds the DAC. Should any of you grab the LAuX you will see how it is all arranged.