"I don’t want to trigger another debate or an argument. But in my opinion toggling between DACs on the fly even with all cabling matching is at a minimum less than ideal way to compare DACs. This will only work if you are comparing a $200 DAC to a $5,000 one."
@audphile1 - If that is a response to my earlier post, I would ask you, have you tried it? I would also clarify that this was not the old choose A or B comparisons we all did in the 1980's at the local stereo shop. These were DACs that I either owned at the time or were on long'ish term loans from the manufacturer (i.e., like a month). Therefore, the toggling back and forth was only one part of a much longer comparison process that involved a lot of different music, multiple cables, and other variations in set-up.
My conclusion is that our aural memory is short and the longer the time between our comparisons, the greater the opportunity for our predisposition toward a certain outcome to override what we actually heard, IMO. When I was able to simply switch between the two DACs, as a song was playing, I was much more confident in the differences and similarities I was hearing. Roger Russell did the same thing with his cable comparator.