What makes you think your ears can hear more accurately than Audyssey? Can you adjust the low end in 100 increments, by ear? No, you can't. The chance of getting the same results are infinitesimally small. Do you wear hearing protection when you work with power tools? Do you crank your stereo when you drive? Do your ears ring? If you answer with no, yes and yes, you CAN'T hear accurately enough to do this as well as Audyssey.