Extension Bar Attachment Options - JBL VTX Series Rigging Manual

8.4 EXTENSION BAR A TT ACHMENT OPTIONS
The VTX A8 AF EB Extension Bar includes three attachment positions for connection to the VTX A8 AF Array Frame. The three positions
allow for greater aiming resolution when an array is suspended from a single point. In single-point applications, the array aiming is de-
termined by the shackle position on the Extension Bar. The A8 Extension Bar includes 15 shackle positions, spaced 51 mm (2 in) apart,
to maintain the structural integrity of the bar. Even at 51 mm apart, however, the spacing is typically too coarse for precise sub-degree
aiming, and a shackle position is needed between two holes. The three attachment positions (A, B and C) allow for two additional shack-
le positions between holes, increasing the total shackle positions to 60.
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 shackle position and attachment combination 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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