think about it - 1150 feet per second or so? and the drivers are out of sync by say 6" (to make the numbers simple)?Then the difference in path length results in one signal arriving 0.5/1150 or 0.4 milliseconds later? Not likely to be noticable even by a bat.
And then you get to the really silly part - on what axis are the voice coils equidistant from your ears? Maybe you have to put some paint cans under the couch legs to make sure you're on axis.