Albertporter...I don't want to get mixed up with the power cord thing, but perhaps you could explain why you think (pronounce actually) that, in general, a long term listening comparison is better than a quick A/B. In my experience long term comparisons become very subjective, so that it is easy to "hear" differences that don't really exist.
I agree that long term listening is the best way to determine if you really like the sound, but, to detect changes, I think that the quick A/B is best.
I agree that long term listening is the best way to determine if you really like the sound, but, to detect changes, I think that the quick A/B is best.