5.0EVA Rigging System
5.1Overview of the EVA Flying System
The external rigging parts supplied with each EVA line-array module attach to metal parts internal to each module, so that a finished array places no stress on the wooden enclosure parts. The rigging simplification inherent in the EVA modules is based on the final array being assembled in a fixed manner. The EVA en- closures are vertically trapezoidal—taller at the front than at the back. One module is fastened to another with the bottom of one in contact with the top of another. The vertical aiming angle between the two mod- ules is fixed by their vertical draft angles. The draft angle is 3° for the EVA-2082S/906 and EVA-2082- S/126 long-throw modules and 10° for the EVA-2082S/920 and EVA-2082S/1220 short-throw modules, producing 6°, 13° or 20° between any two modules, depending on which modules are attached together. (The specific selection of long- and short-throw modules and their arrangement is dependant on room ge- ometry and trim height. These choices are facilitated by Electro-Voice’s EVA Design Assistant [EVADA™], software available on the EV Web site, www.electrovoice.com. See section 3.0 Designing an EVA Array above.) Each EVA module is attached to the module below it by the supplied pair of side-mounted tie plates. After the array is assembled, cosmetic end caps, one for each side of each module, are attached to the enclosure, hiding the structural tie plates and giving a smooth, attractive array appearance.
A basic array is shown in Figure 14, which illustrates the basic components that make up the EVA flying system.
| | EVA Grid | |
| | Attach Spreader Bar | |
| | with M10 Shoulder | |
| | Bolts and Nylon | Spreader |
| | Washers Supplied |
| EVA Modules | Bar |
| with Grid |
| |
| | Attach Grid Side | |
| | Arms with M10 Bolts | |
| | Supplied | |
| Attach Tie Plates with | Tie Plates |
| (2 Supplied with |
| M10 Bolts Supplied |
| each EVA Module) |
| |
Grid
Side
Arm
Nylon
Washer
M10
Shoulder
Bolt
EVA Module
Grid Assembly Detail
Note: Cosmetic End
Panels Not Shown
Figure 14:
Typical EVA flying system
20 | Electro-Voice® EVA Series User Manual |
