From Wikipedia:
"In the fields of science, engineering, industry and statistics, the accuracy of a measurement system is the degree of closeness of measurements of a quantity to its actual (true) value.
If this were a pro-audio forum where there was some aspect of engineering and science to what the participants were being relied upon to accomplish, this might be something to consider. But this is a forum of end-users - those who assemble equipment in order to enjoy the music. Let me say that again, as it has been said so many times in this thread: The goal here is TO ENJOY THE MUSIC. You can use whatever criteria fits your own personal take on it, and if your own interpretation of what "accuracy" means to you fits into that personal interpretation, then so be it. It does not matter and you will never find any remotely universal agreement on any of it.
05-13-11: Abucktwoeighty
100% accuracy means perfection. 95% accuracy does not.
Accuracy has nothing whatsoever to do with perfection. Accuracy is a notion that is objective, Perfection is judgment which is entirely subjective and will not be universal ("perfect" beauty for a westerner may be a polar opposite for someone from a tribe in Africa or from an Asian or Persian culture). What is a perfect movie or perfect book? Perfect music? Perfect clothing? Perfect food? Any answers to those are simply an opinion and nothing more. If we were to believe MrTennis and Abucktwoeighty, then a perfect movie is the one that is 100% accurate....perfect beauty is 100% accurate...a perfect musical performance is one that is 100% accurate. Accuracy is essentially true or false and nothing more. It has little to do with how human beings perceive and interpret the world around them and does require a universal agreement as to what defines what is true and what is false in any application of the word. In absence of that universal agreement you will never have "accuracy". You will NEVER find such a universal agreement on any notion of "perfection" or personal tastes. It is not remotely the same.

