Surround : Surround Panning and Mixing : Divergence and Center Percentage

Divergence and Center Percentage
For more information, see the following topics:
The Divergence and Center Percentage controls range from 0 to 100, and can be automated. They are especially useful for ensuring audibility and coverage in large venues, and to increase clarity of voices.
Front Divergence
Controls divergence between front speakers (X-axis only).
Rear Divergence
Controls divergence between the rear speakers (X-axis only).
Front/Rear Divergence
Controls divergence between front and rear (the Y-axis).
Center % (Percentage)
Determines whether there is a discrete center image, a completely phantom center image, or a variable amount in between.
Side % (Percentage)
Determines whether there is a discrete side image, a completely phantom side image, or a variable amount in between the right and left side channels for 7.1 and 7.0 formats.