Like I've said before merits pro or con of ABX testing, I just liked the fact that with the old ABX corp equipment the change between A and B was noiseless and almost instantaneous. So which one do you like better A? or B? Not after f'ing around changing cables/components but right now. A? or push a button B? Release the button A? or push the button B? Relying on MY long term auditory memory is useless when it comes to subtle differences. And the older I get I think the more useless it is.