The nice thing about this is that Audyssey is still in charge of creating the filters. I believe by manually entering the control points simply help Audyssey to do a better job of creating more\/accurate filters than the auto process that has to rely on the operator, and limited by the resolutions even with the 4X improvements over XT in the bass band. Audyssey auto doesn't have the benefits of seeing the actual effect shown by REW\/Mic. So we are just providing a feedback loop :D in effect by entering the new control points based on what we see on the REW graphs. So you can't mess it up if you follow the REW graphs hints and enter the control points in a logical fashion. \n\nThe most important thing to do is to avoid entering too much boost, as Jon AA allude to. The key is, try improving things with cuts, and only boost if there is no other way. I learnt that from using the mini\/REW equalizers too, you could make things much worse, and\/or unstable if you boost too much, anything more than 3 dB should be avoided as much as possible, you never know if Audyssey has already applied the maximum boost at the same points, until you see some totally erratic results.