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Working Load Limits
There are several methods that can determine if the array design is approaching or has exceeded the WLL of any element:
1) Consult a Licensed Professional Engineer
The preferred and recommended method is to consult with a licensed professional engineer, as part of the approval process that is
required by most local building codes. The engineer will usually calculate a "free body review" of the array to determine the reaction
forces on the mounting fasteners of the array modules, rigging hardware, and building attachment points.
2) Contact Your Local Bose Professional Systems Division Field Engineer
Authorized Bose Professional Systems Division AV Integrators and Design Consultants may contact their local Bose Field Engineer
of Technical Support Specialist. These professionals may use the "RoomMatch Array Frame Suspension Angle Calculator" software,
which can help predict the shackle pickup points that are required to achieve specific array pitch angles. Additionally, the software
will indicate when array Working Load Limits are nearing or exceeding safe rated values, or when an additional third suspension
point using the RMPULL bracket is required.
3) Use the Simplified Array Load Limit Guidelines
For smaller, less complex array configurations, a table of Simplified Array Load Limit Guidelines is presented in this manual that de-
fines the frame size, number of array modules, number of subwoofer modules, total included vertical angle of array modules, and the
maximum array pitch angles, that will allow safe Working Load Limits. See the data tables on pages 12-14 of this document.
General Guidelines for RoomMatch Array Rigging
The following general guidelines apply to all configurations of RoomMatch arrays (unless otherwise specifically approved by a licensed
mechanical or structural professional engineer):
1) Small Array Frame may contain a maximum of 4 modules (full-range or subwoofer).
2) Large Array Frame may contain a maximum of 8 modules (full-range or subwoofer).
3) Subwoofer modules must always be located in the top positions (closest to frames).
4) The total included vertical angle of all modules should not exceed 120 degrees.
5) The mounting holes on the rails of the grids (Ø 0.81") have been sized for a nominal 5/8" shackle. A 19-mm shackle may also be
used. Use of smaller sized shackles is not recommended.
6) Extender Bars must be used with the Large Array Frame (will not fit the Small Array Frame).
7) Extender Bars (Long or Short) may support a maximum of 2 subwoofer modules.
8) Each of the Extender Bars has an IN and an OUT position. Two fasteners are used to connect each extension to the grid. The exten-
sions should never be used with fewer than 2 fasteners per side (total of 4 fasteners).
9) Do not suspend modules directly from side-plate hardware using wire rope (without array frames).
10) Use only the outer left and right rails in the Array Frames for permanent attachment to building structures.
11) Do not use the center rail of array frames as the only permanent attachment point. The center rail is designed only for temporary
support for elevating arrays using chain hoist or other lifting devices.
Figure 8. Permanent Attachment Points to Building Structure for Array Frames
The Left and Right side rails of the array frames are recommended as the only permanent attachment points as these rails provide the
most direct load path from the frame to the module side-plate rigging system. Additionally, the published values for Working Load Limits
were based on certification testing using the Left and Right rails connected to the module side-plate rigging.
Page 10
Installation and Safety Guidelines
pro.Bose.com
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