The thing I begin to question is at what point can there be too much excursion? I mean, a woofer can cease to be accurate at some point can't it? There comes to be a point in that the woofer cone must travel so far that there is too much time taken up to push the cone out and then pull it back to complete the stroke. Doing that 60 times a second and spanning 6" there has to be some delay at some point or a loss of accuracy. I could be wrong or forgetting something here, but it makes sense.
I understand that the cone moving out and back in 20 times a second is a 20hz sound wave. However, if a cone is moving 3+ inches out and back and another can do the same thing (frequency) at the same output level but only has to move 1.5 inches could it not techinically have an advantage for accuracy? I feel it would, as the cone physically has to travel less distance, therefore allowing it the potential to be more accurate. It would definitely be more efficient one would think.
Perhaps Chris (Wmax) could weigh in here.