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When hanging an array from only two chain motors, choosing the orientation of the two suspension
points will determine the horizontal coverage of the entire array. Choosing two points on a line parallel with the
front of the stage will give equal coverage to each side of a perpendicular to the stage. Moving the off-stage
(outside) hanging point up-stage (towards the back of the stage) will swing the coverage of the speaker array
out, towards the sides, usually desirable in larger venues where seats wrap around the sides of the stage.
Precisely locating the suspension points may require extra steel ropes and shackles to create bridles
from available points that will reach the desired position over the ground. This process involves calculations for
the materials and load that should only be performed by experienced professionals.
Suspending an Array
After chain-hoist motors have had their chains correctly attached to the suspension points, the motors
can be raised off the ground and the Truss Modules can be hung from the chain hoist's hook with slings. Slings
can be made from either wire rope or synthetic polyester fiber (SpanSet
to handle and softer on equipment, their fire ratings are relatively poor compared to wire rope. Fire codes will
vary - consult local authorities before installing fiber slings.
Individual truss modules can be hung with a single vertical hitch from the chain motor's hook to the
truss module's pick-up point on the hanger bar. Double-columns of speakers can be hung from a single motor
with a bridle hitch using two separate short slings, with an angled leg connecting each truss module to the
motor's hook. All parts used to suspend the array must be rated for the load and angle at which they are being
used.
IMPORTANT NOTE: It is advisable to consult and engage a qualified rigger when making
decisions related to purchase, setup and use of any equipment and techniques that will be used
to suspend any temporary loudspeaker system above areas that will be occupied by persons.
This equipment and general topical discussion is not to be taken as a working guide to
configure specific arrays for individual conditions, which will vary considerably based upon the
application. Seek specialized professional help when needed.
TM
). While fiber slings are lightweight, easy
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