Selecting Spreader-Bar Positions - JBL VTX Series Rigging Manual

13.5 SELECTING SPREADER-BAR POSITIONS

Each of the Mini Frame side arms includes 22 hole positions for attaching the spreader bar. The position of the spreader bar determines
the overall site angle of the array. The further back the spreader bar is attached, the more down angle is generated and vice versa. The
exact position of the spreader bar for a given angle is determined using Line Array Calculator 3 software. Position 14 corresponds to the
center-of-gravity of the B18, and is marked as such on the Mini Frame side arms. It can be used to suspend B18s flat (aimed parallel
to the ground).
The Mini Frame can be attached to an array in either the standard (rear) or reverse (front) positions depending on the required overall
array angle. The standard orientation is more suitable for large down angles, while the reverse orientation is more appropriate when large
up angles are required. In both configurations, the top A8 cabinet should be set to the 4° position.
EXAMPLES:
• Normal frame orientation with spreader bar set to position 15, creating downtilt.
A
• Reversed frame orientation with spreader bar set to position 18, creating uptilt.
B
A
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VTX A8 | Rigging Manual
B