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3.0 Designing an EVA Array (cont')
Figure 6 shows the Report tab of the EVADA spreadsheet, showing such details as hang points (in this
example, pinhole 0 on the centerline of the EVA-CG coupler grid), type of hang point (main or pull-
back), load (lb or kg), modules in the array and their vertical aiming angles (note that the module inclination
angle is measured at the rear panel of the module).
Figure 6:
EVADA
Report tab, with many physical array details
TM
The Subwoofers tab allows the user to assemble subwoofer arrays and assess the inevitable multiple-
source interference that occurs when two or more arrays are displaced horizontally. This is done by
showing the horizontal polar response of subwoofer arrays at three frequencies. The default frequencies
are 100, 80 and 60 Hz but can be changed. The option of changing the polarity of each subwoofer and
inserting up to 9.9 ms of delay in any one group of subwoofers is available. These options may be found to
smooth the interference patterns.
The Preferences tab allows the user to change the colors associated with each array element or module.
Refer to the Preferences help file for details.
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Electro-Voice EVA Series User Manual
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