The DS7 offers a choice of both monopole and dipole operation, either via a switch located on the front baffle, or remotely, using a 12V trigger from the surround processor. Some processors allow you to program the 12V trigger according to the type of material being played, so you can automatically switch between the two modes if desired.
In monopole mode, only the two drive units on the front face operate. In dipole mode, the front tweeter is disconnected; the two side firing drivers are brought into operation and the crossover frequency to the bass unit is lowered. The side units are connected out of phase with one another, which creates a wedge-shaped null zone at right angles to the wall. If the listeners sit within this zone, they become less aware of the location of the speakers and hear more reflected sound; hence the diffuse nature of the sound field.
