The best way to tweak speaker position is 2-channel in phase and out of phase pink noise.
In phase should come from a well-defined point dead centre. With my actives, that point is more like a medicine ball. It's very righteous.
Out of phase shows you the relative response left vs. right. If your speakers are placed symmetrically in your room, the responses should be equal. If not, the one closer to the sidewall will have a diminished response relative to the other.
With a good sound system (which includes room and placement), you should not have to play loud to experience emotional fulfillment. Since I added more subs, I've been able to turn the volume down even further. I love it!
