pro.Bose.com Working Load Limits
Installation and Safety Guidelines Page 9
Determining Acceptable Load Limits of the Entire Array
The determination of safe Working Load Limits for an entire array of RoomMatch™ modules is a complex process that is recommended
only for experienced professional installers and engineers. The first check is to confirm that the total column weight does not exceed the
WLL rating for any module or rigging accessory. The second check is to confirm that the rotational, or moment force (torque), does not
exceed the WLL rating for any module or rigging accessory. The moment force calculation must be based on the shape of the overall
array, which determines the relationship of the center of gravity for the overall array, as compared to the fastener locations each array
component. In some array configurations, the moment forces can impart moment loads on a component that exceeds the WLL rating,
even though the total weight of the array is less than the WLL rating for any component. For example, the following illustration shows
the output of the “RoomMatch Array Frame Suspension Angle Calculator,” which highlights that the WLL of the top module has been
exceeded, even though the total column weight of the modules is less than the WLL rating of the top-module enclosure:
Figure 7. RoomMatch™ Array Frame Suspension Angle Calculator WLL Warning Message
As the array pitches downward, the system center of gravity (the dotted arrow pointing downward) moves further back (to the left as
shown in the chart). This increases the moment load on the mounting fasteners which pushes them beyond the module WLL prior to
reaching the maximum weight limit. This rotational force is more complex to calculate for RoomMatch arrays as compared to calculat-
ing similar forces for conventional line array loudspeakers due to the variety of RoomMatch module physical dimensions and included
angles.
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