15
This simple technique provides the added benefit of softening the projection of the dominant low/mid lobe.
This spatial smoothing results from introducing asymmetry to the mid frequency line source drive signals.
As a result, the shading adjustment tempers the low/mid output in the far field, providing extremely consistent
mid-range coverage throughout any venue.
The dramatic impact of this array shading can be readily demonstrated by creating a model of array performance
using EAW's Phased PointSource Technology optimization and modeling program, F-Chart*. These complex
frequency response charts predict array performance at a variety of listening positions. For the sake of legibility,
only three locations are shown (0°, -10°, -20°). These locations are illustrated in Figure 2.
Array Response Locations
At 0
°
, -10
°
and -20
°
, these are the listening locations used in our model
Please note that the data presented below are based on a computer model of how a line source behaves as described
in such acoustical texts as Beranek and Olsen. Before building the full array model, EAW engineers created a
preliminary model of a single KF750 midrange device and then performed extensive measurements of an actual
KF750 to confirm the model's accuracy. Thus while these graphs do not represent actual array measurements, they
are based on measured data.
Figure 2
* For more information of PPST, visit the following URL at our website:
http://www.eaw.com/pages/TechSupport/Technologies/NewConcepts/PPST.html
Summary of Contents for KF750 Series
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