and then re-position them, and then tweak them again, and again, and again, and then have some friends come over and move them once more or so, and then come back the next day and re-measure and re-tweak them again ... etc.
... until you finally decide they sound pretty good, sit back with a nice beer or two, get up to go to the bathroom and bump into one panel moving it off it's perfect pinppoint position and have to start all over again.
Just sayin'