Extension Bar Attachment Options - JBL VTX Series Rigging Manual

8.4 - EXTENSION BAR A TT ACHMENT OPTIONS
The VTX A8 Extension Bar includes three attachment positions for connecting to the A8 Array Frame. The three positions allow for addi-
tional aiming resolution when an array is suspended from a single point. In single-point applications, the array aiming is determined by
the shackle position on the Extension Bar. The A8 Extension Bar includes fifteen shackle positions, which are spaced apart by 51mm
(2") to maintain the structural integrity of the bar. Even at 51mm apart, the spacing is typically not frequent enough for precise sub-de-
gree aiming, and a shackle position is needed between two holes. The three attachment positions (A, B and C) allow for two additional
shackle positions between holes and increases the total shackle positions to sixty.
3
2
1
The example below shows how the real and "virtual" positions are spaced across the extension bar.
B
A
TIP: Refer to JBL's Line Array Calculator software to determine the best possible shackle position and attachment combi-
nation to achieve the required array angle.
7
6
5
4
A
B
C
C
B
A
C
B
A
C
VTX A8 | Rigging Manual
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9
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28
12
13
14
15