LA12 & LA12C User’s Guide
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When de-rigging the system ensure that the same care is given to the procedure as for
the installation. Pack components carefully to prevent damage during transit.
3.3 GROUND STACKING LOUDSPEAKERS SAFELY
Statistically, many more injuries occur due to unstable ground stacked PA systems
than to improperly flown systems. There are several reasons for this fact, however the
message is clear. Always survey the supporting structure upon which a ground stack is to be
built. Always look beneath PA wings to inspect the deck support and if necessary ask for the
stage scrims and dressings to be removed to allow access. If the stage surface slopes, as it
does in some theatres, ensure that the system is prevented from sliding forward due to
vibration. This may require attaching wood battens to the stage floor. For outdoor systems,
ensure that that the system is protected from wind forces which might cause the ground stack
to become unstable. Wind forces can be huge, especially upon large systems and should never
be underestimated.
Observe meteorological forecasts, calculate the “worst case” effect upon the system
prior to erection and ensure that the system is secured appropriately.
Take care when stacking cabinets. Always employ safe lifting procedures and never
attempt to build stacks without sufficient personnel and equipment.
Never allow anyone, whether operators, artists or members of the public, to climb onto
a ground stacked PA system.
Anyone who needs to climb over 6 feet high should be fitted with suitable safely
equipment including a clip-on harness. Please refer to local Health and Safety legislation in
your territory.
Apply the same attention to all safety matters when de-stacking systems.
Be aware that safety procedures are as important in the truck and in the warehouse as
they are at the venue.
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