JBL VTX Series, Manual

Page: 54 / 78

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VTX A 12 | Rigging Manual
13.2 ANGLE SELECTION MECHANISM
The Angle Selection mechanism sets the ground stack array angle. Two quick release pins select and secure the angles. One pin sets the
angle (STEP 1 - SET ANGLE), while the other locks it when the desired angle is reached (STEP 3 - LOCK ANGLE). As the label indicates,
the process for setting an angle is three steps: selecting the desired angle, lifting the array to reach the angle, and locking the angle.
The included gas springs work against the weight of the array to make lifting it effortless. Note that both sides of the VTX A12 VT GND
must be set and locked at the same time.
The Angle Selection mechanism settings correspond to the site angle of the VTX A12 enclosure connected to the GND (the bottom
speaker of the array). For example, if -15° is selected on the GND, the bottom speaker of the array will point down at a 15-degree angle.
If +5° is selected, the bottom speaker will point up at a 5-degree angle. These numbers are not related to the top enclosure of the array,
and LAC-3 should be used to determine the overall angle of the ground stack.
CAUTION:
• The quick release pins should always remain in their storage positions until the ground stack has been at-
tached to an A12 array and the screw jacks used to lift the stack off the ground . Lifting the stack off the ground
shifts the weight of the array to the gas springs, releasing the storage QRPs .
• Both SET ANGLE and LOCK ANGLE QRPs should be set to the same position . If the SET ANGLE QRP is set to
the +3° position, the LOCK ANGLE QRP should also be set to the +3° position .
GROUND STACK SET TO -15° GROUND STACK SET TO +5°