ABX is a tricky test. It can easily trick your mind. The only way to test it a long term listening. Listen for a few days, and the change to the other one. The differences will be plainly audible.
emm labs dac2se vs puccini
For those who want to know I just a/b'd the dac2se with using the usb computer out vs the dcs puccini on red book cd's. Not one iota of difference to be heard. I even had people in the room who were interested in the comparison and not one of them heard a difference. Great soundstage on both. Although I did not have the tsd1 to play SACD's I listened to the puccini on SACD's and it did sound amazing!!!