6.0
6.2 Structural Rating Overview
Designing a safe structural array is ordinarily a very complex process best left to experienced profession- als. To make EVA systems both safe and easy to use,
There are two independent strength ratings that, together, give a complete description of the overall struc- tural capabilities of any loudspeaker system; which are:
1.The strength of each individual enclosure rigging point; which is the combined strength of the internal rigging straps, external tie plates, bolts and enclosure.
2.The total strength of the overall array; which is a function of the combined forces from all of the rigging points acting on the rigging components and the array as a whole.
For grids, there are also two independent strength ratings that, together, give a complete description of the overall structural capabilities of the grid; which are:
1.The strength of each individual grid rigging point; which is the combined strength of the bolts, grid side arms and spreader bars.
2.The total strength of the overall grid; which is a function of the combined forces from all of the rigging points acting on the rigging components and the grid as a whole.
In any system, the forces acting on each loudspeaker (on each individual rigging point and on the overall enclosure) and the forces acting on each rigging accessory (grids and spreader bars) will vary with each array configuration. Determining those forces throughout an array requires complex mathematical cal- culations.
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