JBL VTX Series, Manual

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VTX A 12 | Rigging Manual
13.6 GROUND STACK LIMITS
The VTX A12 VT GND ground stack accessory can safely support the weight of up to four VTX A12 enclosures under any array con-
ditions. This includes setting all VTX A12 cabinets to the 10° position and the GND to +5°, which is the most extreme ground stack
scenario. The VTX A12 VT GND can support the weight of up to six VTX A12 enclosures when the array’s Center of Gravity (CoG) aligns
sufficiently closely to the center of the GND as to not create a tipping hazard. In general, straight arrays of up to six A12 enclosures will
work, but curved arrays tend to push the CoG towards the rear of the GND, which may limit the number of enclosures to four. JBL Line
Array Calculator 3 software calculates these conditions in real time and should always be used to determine array parameters. If an array
is unsafe, LAC-3 will display an error. Below are some valid and invalid examples, as shown in LAC:
(4) VTX A12 - Straight Array (4) VTX A12 - Curved Array
(6) VTX A12 - Straight Array (6) VTX A12 - Curved Array
Center of Gravity Center of Gravity
Center of Gravity Center of Gravity