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Cardioid Control Technology
The EKX-15SP and EKX-18SP subwoofers have cardioid array processing originally developed
for Electro-Voice concert subwoofer systems. Cardioid subwoofer arrays can be used to direct
the output of an array of subwoofers in order to limit excessive amounts of bass in undesired
areas. These arrays can be used to keep bass off of a stage, provide more consistent bass
coverage in the audience, and reduces bass in the surrounding area.
Multiple EKX-15SP or EKX-18SP can be arrayed to create a cardioid polar pattern. See
Cardioid pattern top view. The cardioid setting in the DSP menu is optimized to produce a
rear rejection of up to 35 dB without any additional processing. The rejection may be less in
smaller indoor environments than in larger outdoor environments. For best performance,
adhere to the following guidelines:
The subwoofers must all be the same model, for example all - EKX-15SP or all - EKX-18SP.
▪ The subwoofers must be physically placed in one (1) of the options shown. See Cardioid
physical alignment.
▪ Front firing subwoofers use the NORMAL location setting, and rear firing subwoofers use
the CARDIOID setting. All other settings should be the same between front and rear firing
subwoofers. For more information, see Subwoofer DSP control menu, page 28.
Figure 7.1: Cardioid pattern top view
7.6
EKX Powered Loudspeakers
2015.02 | 03 | F.01U.308.095 User Manual Electro-Voice
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