Cardioid Modes; Symmetrical; Asymmetrical - Void Arcline 218 User Manual

6 Operating modes

6.3 Cardioid modes

As low frequency enclosures are omnidirectional, rear projection can cause a range of
difficulties. If there is a wall behind the array, the sound wave can reflect off the surface and
may cause cancellation in front if it arrives out of phase with the wave from the source.
Another problem may occur during performances where an array is deployed in front of
the stage, possibly creating a maximum sound pressure level that makes it difficult for some
performers. Utilizing a cardioid configuration will reduce stage noise and increase forward
directivity at the cost of more loudspeaker power.
The Arcline 118 and Arcline 218 can be arrayed in a variety of cardioid configurations
depending on the requirements of the system with a few examples shown below. For other
layouts or more information, please contact your local Void distributor/dealer.

6.3.1 Symmetrical

A symmetrical layout, as shown in figure 6.2a and
6.2b, will reduce rear rejection.
Note that figure 6.2a, an Arcline 218
stacked vertically above an Arcline 118,
can be top heavy and may have a danger
of falling. It would be advisable in this
configuration to ensure that the array is
securely strapped down.

6.3.2 Asymmetrical

In the case of an asymmetrical layout the
cancellation has the effect of directing the sound
away from the loudspeaker that has been inverted. So
in the case of the arrangements shown in figure 6.3
the sound level to the right will be reduced.
Arcline 218 User Guide V1.0
Figure 6.2a Figure 6.2b
Figure 6.3
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