CAUTIONS for a Complex Structural Rating Analysis (continued):
5.Only use Xvhl linking hinges, Xvhg grid hinges, or Xrhp pickup hinges manufactured by Electro-Voice.
6.Only use Xvsg, Xvsl, Xvsd or Xvsf front rigging assemblies manufactured by Electro-Voice.
7.Only use Xvbp pull-up bars manufactured by Electro-Voice.
8.If RS-1B double-stud swivel-ring fittings are used, never exceed the working-load limit for the RS-1B at either the front or the back of any enclosure in an array.
9.When a pull-up assembly is used, never exceed the working-load limits of any of the components making up the pull-up assembly.
10.When a pull-up assembly is used, never apply a pull-up force greater than that required to eliminate any slack in the front rigging chains.
3.5 Wind Loading
The X-Line loudspeaker systems have been designed to survive winds of up to 60 miles per hour (96.6 kilometers per hour) if the bottom cabinet is rigidly secured. For obvious safety reasons, Electro-Voice urges the user not to suspend any loudspeaker systems overhead outdoors when high winds are expected. When suspending X-Line loudspeaker systems outdoors, the user is strongly encouraged to rigidly tie off the bottom cabinets in all arrays as a safety precaution against unexpected high winds.
An Xvbp pull-up bar with an attached strap may be used to secure the bottom cabinets. Xvhp pick-up hinges may also be used. The tie-off assembly must have a working-load rating of 2000lbs (907kg). A ratchet strap with a 2000lb working-load rating must be used for the pull-up assembly.
3.6 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 systems.
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 the X-Line 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.
