5.
ARRAY OPERATION
5.1
OVERVIEW
The operation of a KF740 Series system involves:
1. Understanding the principles on which it operates.
2. How to electronically configure it for a specific task.
5.2
ENGINEERING DESIGN
How a KF740 Array works: Divergence Shading
In almost any venue, there are significant differences in distance from the loudspeaker array to
the nearest and farthest audience members. The idea is to turn up the output level of the array
aimed towards the farthest audience members, and then progressively turn it down for audience
members closer to the array. These differences in distance are accompanied by changes in the
array’s vertical aiming angle.
Rather than use amplifier input levels, the volume controls for a KF740 array is a combination of
the shape of its curvature and the quantity of KF740 units that make up the array. A shallow curve
means more loudspeakers are facing a given direction, putting more energy within a given
vertical angle. A more radical curvature for the same number of loudspeakers spreads the energy
over a wider vertical angle, reducing the energy at any particular point. Simply put, less curvature
turns the volume up and more curvature turns the volume down.
If you understand this point, you understand how a KF740 array works. Specifically:
1. More splay at the rear of the enclosures turns the volume up (adds less curvature to the
array)
2. Less splay at the rear of the enclosures turns the volume down (adds more curvature to
the array).
3. More enclosures provide a greater vertical coverage angle.
4. Fewer enclosures provide less vertical coverage angle.
EAW Rersolutionuses the above variables to determine the quantity of enclosures and the
variation in curvature along the length of the array that will optimize coverage for the audience
distances and angles the array must address.
5.3
SIGNAL DIAGRAM
The signal diagram shows the signal flow for a single KF740. An
EAW UX8800 processor is required to provide proper signal
processing to drive each section of the loudspeaker.
5.4
SIGNAL PROCESSING
Use the EAW UX8800 digital signal processor with the KF740.
Each system of KF740 used will require three outputs of a single
UX8800. For more information on the UX8800 including
EAWPilot software used to control and program the UX8800
from a PC and Greybox pre-programmed settings visit
www.eaw.com/products/ux8800.html.
WARNING:
The KF740 has been optimized for use with the EAW UX8800 processor only. KF740
array performance, in terms of frequency response, beamwidth consistency, output level
capability, and wavefront coherency is dependent on the EAW engineered Greybox settings used
by the UX8800.
Page 8 of 22 KF740 OWNER’S MANUAL
