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Electro-Voice® EVA Series User Manual30
6.0 Rigging-Strength Ratings and Safety Factors (cont’)
6.4 Electro-Voice Structural-Analysis Procedures
Electro-Voice maintains a structural pull-test facility in Burnsville, Minnesota USA which includes load
cells with digital-electronic display and recording. The load cells are calibrated annually by an independent
laboratory to a standard traceable to the United States National Bureau of Standards. This pull-test facility
is capable of pulling to destruction both individual rigging components and complete loudspeaker sys-
tems.
Electro-Voice utilizes state-of-the-art computer-modeling programs for structural analysis throughout the
development of loudspeaker systems. The computer modeling enables the complex forces in the rigging
components and enclosures to be analyzed for loudspeakers assembled into arrays in both static and
dynamic conditions.
Structural testing and computer modeling were used throughout the engineering development of all EVA
individual rigging components and complete loudspeaker systems described in this manual. Testing and
modeling involving both anticipated use and anticipated misuse were performed as part of the analysis.
Engineering prototypes were stressed to failure and designs were revised based on those test results.
Production systems and components were stressed to failure for verification of the final designs.