User manual

Electro-Voice EVA Series User Manual 23
5.0 EVA Rigging System
5.1 Overview of the EVA Flying System
The external rigging parts supplied with each EVA line-array module attach to internal metal parts run-
ning top-to-bottom in 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 as a single rigid structure. When flown as a single vertical column with EVA full-range
modules, EVA subwoofer modules must always be assembled at the top of the array with no splay be-
tween them. The EVA full-range enclosures 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 modules is fixed by their vertical draft angles. The draft angle is 3° for the
EVA-2082S/906 and EVA-2082S/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 geometry 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.
Figure 14:
Typical EVA flying system
Note: Cosmetic End
Panels Not Shown
EVA Grid
Attach Grid Side
Arms with M10 Bolts
Supplied
Attach Tie Plates with
M10 Bolts Supplied
Tie Plates
(2 Supplied with
each EVA Module)
EVA Modules
Attach Spreader Bar
with M10 Shoulder
Bolts and Nylon
Washers Supplied
with Grid
Grid Assembly Detail
M10
Shoulder
Bolt
Nylon
Washer
Grid
Side
Arm
Spreader
Bar
EVA Module