Building A Ground Stack - JBL VTX Series Manual

13.4 BUILDING A GROUND ST ACK
Follow the steps below to safely assemble a VTX A12 ground-stacked array using the VTX A12 VT GND accessory.
STEPS:
• Connect the VTX A12 VT GND to the VTX A12 VT. First, remove the quick release pins from the FRONT and REAR positions
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• and slide the skates under the A12 stack. Align the front and rear connection points and insert the two QRPs to secure the
ground stack onto the VT. Make sure the screw jacks are adjusted to the furthest counter-clockwise position to allow sufficient
clearance for the GND to fit under the VT.
• Use the four corner screw jacks to lift the VT off the ground. Rotate the screw jacks clockwise until all four red wheels are off
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the ground by approximately 38 mm (1.5 in).
• Pin the A12 enclosures to their desired positions, for example, 2°, 4°, 8°. The top A12 enclosure can remain set to the STOR-
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AGE position, as it is not used.
• With all A12 angles selected, lift the top cabinet in the array by its rear handle until the auto-locking mechanism engages at
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the chosen angle. Work your way down the array, lifting each cabinet to its angle. Once set, auto-lock holds the speakers at
the selected positions.
• Remove the two angle selection quick release pins on the VT GND from their storage positions. The stack is now free to move
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up and down. Use the SET ANGLE QRP to select the desired angle for the stack (for example, -7°). Both sides must be set to
the same position.
6 • Push the A12 stack upwards until it reaches the selected angle and stops moving. Insert the LOCK ANGLE quick release pins
at the position on the VT GND matching the selected angle (in this example, -7°) to secure the stack.
7 • If more than four A12 cabinets are used, add the rest of the A12 cabinets to the stack.
VTX A12 | Rigging Manual
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