Electro-Voice EVF/EVH EVF-1151S - Manual (Page 32)

Electro-Voice EVF/EVH User Manual 32
5.0 EVF and EVH Rigging System (cont’)
5.23 HRK Kits and Horizontally Rigged Clusters
The main difference between the HRK and the VRK rigging kits is the addition of a tie plate in the center
of the rigging plate. Tie plates are identified in Figure 22.
MAIN SUSPENSION LINES AND PULL BACKS MUST BE TIED TO THE TIE PLATES.
Enclosures may be suspended below using the HRK rigging kits. Connection between the enclosures
through the tie plates within the HRK kits requires hardware supplied by the end user. All user-supplied
hardware must be rated for overhead lifting. The angle between the two enclosures as well as the angle
between the first enclosure and the structure can be controlled by the length of the user-supplied hard-
ware. If the desired angle cannot be achieved by varying the length of this hardware, then pull-back points
can be used. It is recommended that both the top and the second box use a pull back. A pull back can be
achieved through the use of attachment to the tie plates. Stabilization can be achieved through the use of
M10 eyebolts at the back of the enclosures. The hardware used to achieve the pull back is supplied by the
end user.
A basic two-over-two cluster is shown in Figure 22.
NOTE THAT THE HRK KITS ARE DESIGNED TO MAKE WEIGHT-SyMMETRICAL CLUS-
TERS, I.E., THOSE WHOSE LEFT-TO-RIGHT CENTER OF GRAVITy IS IN THE CENTER OF
THE CLUSTER.
The following components are needed to achieve this cluster:
1. Two HRK-1 horizontal rigging kits for EVF to EVF.
2. User-supplied hardware to link the upper cluster to the lower cluster.