Originally Posted by pepar
I apologize for being dense, but I don't see what the benefit is in measuring L&R simultaneously when the listener would never experience the same thing.
For one thing L+R should = both (+6db) when everything is in phase. If you look at your "both" when you know its correct, and it isn't the synthesis of L+ R, then this steers you towards knowing that some other factor (reflection?) is at work causing them to be out of phase at some given frequency.
Secondly, finding the exact center point gives you a point of reference in order to place your LP chair. Additionally, if the equidistant point is to the left or right of center, it tells you one speaker is further away than the other.
Think of a T
where the bottom of it is where you hear and the left and right of the top of the T are your speakers. If one speaker is further than the other, it tilts the entire T. Thus, the end of the T isnt where your listening at all.
I can go on....