10
VTX A
8
| Rigging Manual
3 - MECHANICAL LIMITS
The VTX A8 suspension system and accessories comply with the 2006/42/EC Machinery Directive and have been designed following
the guidelines of BGV-C1 for a minimum safety factor of 4:1. Minimum safety factor requirements are often set by local regulations and
the JBL Line Array Calculator
TM
should always be used to check mechanical limits.
ARRAY FRAME
NOTES
SAFE LIMIT
MAXIMUM LIMIT
VTX A8 AF + EB
VTX A8 Array Frame with Extension Bar attached
22 x A8
24 x A8
VTX A8 SB
1 x Suspension Bar used as an Array Frame (top)
24 x A8
24 x A8
VTX A8 SB X2
2 x Suspension Bars are used (top and bottom)
12 x A8
24 x A8
3.1 - VTX A8 LIMITS - SUSPENDED ARRAY
TERMINOLOGIES:
Safe Limit:
The safe limit provides the number of cabinets that can be used in an array and always produce a safety factor of 4:1 or
higher. The safety factor of an array is determined by the number of boxes, the array shape, and the overall array angle. An A8 array that
is within the safe limit will always yield a safety factor greater than 4:1 regardless of the array parameters and conditions. Designs much
greater than the safe limit, and up to the maximum limit can be achieved, but the JBL Line Array Calculator software should be used to
check mechanical safety for the given configuration.
Maximum Limit:
Arrays larger than the maximum limit are not allowed under any conditions.
ARRAY FRAME
NOTES
SAFE LIMIT
MAXIMUM LIMIT
VTX A8 AF + EB
VTX A8 Array Frame with Extension Bar attached
10 x B18
13 x B18
VTX A8 SB
1 x Suspension Bar used as an Array Frame (top center)
14 x B18
14 x B18
VTX A8 SB X2
2 x Suspension Bar used at the top (front / rear rigging bars)
14 x B18
16 x B18
3.1 - VTX B18 LIMITS - SUSPENDED ARRAY
NOTES:
• LAC-3 allows for array designs with a minimum design factor of 4:1. Anything lower than that is not allowed
• For exact mechanical limits of combination arrays (A8s suspended under B18s) always check the design with LAC-3
• For mechanical limits when using dual Suspension Bars always check the design with LAC-3
• For additional information on B18 limits, refer to the VTX B18 Rigging Manual
• ANSI Standard E1.8-2005 (Entertainment Technology Loudspeaker Enclosures Intended for Overhead Suspension), Section 5.3.4,
specifies a minimum safety factor of 5:1. If compliance with the ANSI standard is needed, make sure that the array design in LAC-3
produces a minimum safety factor of 5:1
