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7.3 ARRA Y FRAME A TT ACHMENT OPTIONS
The extension bars include three attachment positions for connection to an array, allowing for greater aiming resolution when an array is
suspended from a single point. In single-point applications, array aiming is determined by the shackle position on the extension bar. The
extension bars includes a good number of shackle positions, 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 shackle posi-
tions between holes, increasing the total shackle positions.
1
2
3
4
The example below shows how the real and "virtual" positions are spaced across the extension bar.
A
B
C
A
TIP: Refer to JBL Line Array Calculator 3 software to determine the best shackle position and attachment combination to
achieve the required array angle.
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6
7
8
A
B
C
B
C
A
B
C
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10
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12
13
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Rigging Manual
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