Electro-Voice EVA Series User Manual
Table of Contents
Rigging-Safety Warning ....................................................................................................................................................3
1.0 Introduction ..................................................................................................................................................................4
2.0 Tool List ......................................................................................................................................................................9
3.0 Designing an EVA Array ...........................................................................................................................................9
3.1 Applications for which EVA Arrays are Most Appropriate ...................................................................9
3.2 Typical Number of Arrays .............................................................................................................................9
3.3 Determining EVA Array Configuration with EVADA
TM
(EVA Design Assistant) Software ...........10
3.4 Other Design Examples ............................................................................................................................ 16
3.41 Dealing with the Relatively High Low-Frequency Variation of Short Arrays .................. 16
3.42 A Five-Module Array Example .................................................................................................. 17
3.43 An Eight-Module Array Example ............................................................................................. 19
4.0 Preparing EVA Modules for Installation .............................................................................................................. 20
4.1 Recommended Preflight Procedures .................................................................................................... 20
4.2 Module Configuration ................................................................................................................................ 20
5.0 EVA Rigging System ............................................................................................................................................... 23
5.1 Overview of the EVA Flying System ....................................................................................................... 23
5.2 Deciding which Grid Configuration to Use with an EVA Array ........................................................ 24
5.21 Standard Grid with or without Second Spreader Bar ....................................................... 24
5.22 Extended Grid with or without Second Spreader Bar ....................................................... 25
5.23 Coupler Grid with or without Second Spreader Bar ......................................................... 26
5.24 Use of Two Standard Grids ...................................................................................................... 26
5.25 EVA-1151D Tie Plates .............................................................................................................. 27
5.3 Assembling and Flying an EVA Array ..................................................................................................... 28
6.0 Rigging-Strength Ratings and Safety Factors ................................................................................................. 29
6.1 Working-Load Limit and Safety Factor Definitions ............................................................................. 29
6.2 Structural-Rating Overview ...................................................................................................................... 30
6.3 Simplified Structural-Rating Guidelines ................................................................................................ 31
6.4 Special Rules when Flying EVA-2151D Subwoofer Modules ......................................................... 33
6.5 EVA Structural Rating Charts .................................................................................................................. 34
6.6 Electro-Voice Structural-Analysis Procedures .................................................................................... 36
7.0 Rigging Inspection and Precautions .................................................................................................................... 37
8.0 References ................................................................................................................................................................ 38
8.1 Rigging (Printed) ........................................................................................................................................ 38
8.2 Mechanical Engineering (Printed) .......................................................................................................... 38
8.3 Rigging (Websites) .................................................................................................................................... 39
Notes .................................................................................................................................................................................. 39
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