JBL VTX B18 Rigging Manual - Page 11

Mechanical Limits, 4.1 VTX B18 Limits - Suspended Array

Get JBL VTX B18 PDF manuals and user guides View all JBL VTX B18 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 11 highlights

VTX B18 | Rigging Manual 4 - MECHANICAL LIMITS The VTX B18 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-3 TM (LAC-3) software should always be used to check mechanical limits. 4.1 VTX B18 LIMITS - SUSPENDED ARRAY ARRAY FRAME VTX A8 AF + EB VTX A8 SB VTX A8 SB (X2) VTX A8 SB (X2) VTX A8 MF NOTES VTX A8 AF - Array Frame with Extension Bar attached (1) Suspension Bar used as an Array Frame (top center) (2) Suspension Bars used at the top (front / rear rigging bars) (2) Suspension Bars used at the top and bottom (pull-back) VTX A8 MF - Mini Frame SAFE LIMIT (12) B18 (16) B18 (10) B18 (12) B18 (4) B18 MAXIMUM LIMIT (16) B18 (16) B18 (16) B18 (16) B18 (4) B18 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. A B18 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 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. 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 • 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 11

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
11
VTX B
18
| Rigging Manual
4 - MECHANICAL LIMITS
The VTX B18 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-3
TM
(LAC-3) software should always be used to check mechanical limits.
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. A B18 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 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 AF - Array Frame with Extension Bar attached
(12) B18
(16) B18
VTX A8 SB
(1) Suspension Bar used as an Array Frame (top center)
(16) B18
(16) B18
VTX A8 SB (X2)
(2) Suspension Bars used at the top (front / rear rigging bars)
(10) B18
(16) B18
VTX A8 SB (X2)
(2) Suspension Bars used at the top and bottom (pull-back)
(12) B18
(16) B18
VTX A8 MF
VTX A8 MF - Mini Frame
(4) B18
(4) B18
4.1
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
•
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