the term "accurate" cannot be used in a comparative sense. a stereo system is either accurate or it is not.
in fact all stereo systems are in accurate. you can say one stereo system is less inaccurate than another, or one stereo system is more colored than another.
If you can say "one stereo system is less inaccurate than another" the opposite is equally true (one system is more accurate than the other) which sounds very much like the term "accurate" is being used in a comparitive sense!