JBL VRX932LA - Manual (Page 10)

10
SUSPENSION SAFETY WARNINGS!
Correct use of all rigging hardware is required for secure system suspension. Careful calculations should always
be performed to ensure that all components are used within their working load limits before the array is suspend-
ed. Never exceed the maximum recommended load ratings. Prior to suspending the system, an expert, trained
and experienced in flying speaker systems should be consulted.
Inspection & Maintenance
Before suspending or pole mounting any speaker system always inspect all components (enclosure, rigging
frames, pins, eyebolts, track fittings, etc.) for cracks, deformations, corrosion, missing, loose or damaged parts
that could reduce strength and safety of the array. Do not suspend or pole mount the speaker until the proper
corrective action has been taken. Installed systems should be inspected at least annually. The inspection shall
include a visual survey of all corners and load bearing surfaces for signs of cracking, water damage, de-lamina-
tion, or any other condition that may decrease the strength of the loudspeaker enclosure. Accessory rigging
hardware provided with or for the JBL VRX932LA loudspeaker must be inspected for fatigue at least annually or
as required by local ordinance. For all other hardware and fittings, refer to the hardware manufacturer's inspec-
tion and maintenance guidelines for process.
Are You New to Rigging?
If you are new to rigging, you should do the following:
•
Read and study JBL Technical Note Volume 1, Number 14: Basic Principles for Suspending
Loudspeaker Systems (available at http://www.jblpro.com/pub/technote/tn_v1n14.pdf).
• Know the rules for safe rigging.
•
Attend a safe rigging seminar, such as that presented by professionals like Rigging Seminars™
(www.riggingseminars.com) or by Chain Motor Hoist manufacturers like Columbus McKinnon Corp.
(manufacturers of the C/M Lodestar).
•
Meet and establish a relationship with a licensed mechanical or structural engineer. Get in the habit of
asking them questions instead of guessing about their answers. Learn from what they tell you.
•
Meet and discuss this aspect of your business with your Insurance Agent.
•
Research and understand the codes, practices, and requirements in the venues where you intend to
operate your sound system.
Attachment to Structures
A licensed Professional Engineer must approve the placement and method of attachment to the structure prior to
the installation of any overhead object. The following performance standards should be provided to the
Professional Engineer for design purposes; Uniform Building Code as applicable, Municipal Building Code as
applicable, and Seismic Code as applicable. The installation of the hardware and method of attachment must be
carried out in the manner specified by the Professional Engineer. Improper installation may result in damage,
injury or death.
JBL is not responsible for the application of its products for any purpose or the misuse of this information for any
purpose. Furthermore, JBL is not responsible for the abuse of its products caused by avoiding compliance with
inspection and maintenance procedures or any other abuse.
VRX932LA-AF Array Frame
The VRX932LA-AF is an array frame kit designed to be used for suspension of the VRX932LA line array loud-
speaker. The optional array frame kit includes an array frame, quick release pins, a pair of forged 3/8” shackles,
and a set of drop levers.
Working Load Limit
The VRX932LA-AF is designed for suspension of no more
than six (6) VRX932LA speakers. The WLL (Working Load
Limit) for the VRX932LA-AF array frame is 136 kg (300 lb)
at a 10:1 Design Factor. The WLL is calculated as follows:
Nominal Material Yield Strength
Design Factor
WLL (Rated Capacity) =