JBL VTX Series, Manual

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VTX A 12 | Rigging Manual
5 - SOFTWARE
5.1 LINE ARRAY CALCULATOR 3 TM
Line Array Calculator 3 acoustical prediction software is used for the design and mechanical validation of VTX Series line array systems.
Using LAC-3 is a three-step process. First, venue dimensions are defined using either X/Y/Z coordinates or the fast distance/angle
method. Second, array configurations are built from VTX loudspeaker models. Third, virtual measurement microphones and a suite of
built-in DSP functions are applied to make predictions of the system’s coverage and the linearity that will be delivered by the defined
array configuration in the specified space. Loudspeaker quantities and models, splay angles, and array aiming can be modified until
prediction shows that the desired coverage is attained throughout the venue. The built-in coverage-and-delay calculator determines
subwoofer delay values for electronic delay steering (EDS) that achieve optimal low frequency coverage.
Beyond acoustical predictions, LAC-3 validates the mechanical properties of arrays and selected JBL accessories. Configuration limits
are calculated in real time, for either suspended or ground-stacked arrays, based on array parameters such as the number of cabinets,
cabinet-to-cabinet splay angles, overall array aiming, and selected accessories. In the case of suspended arrays, a safety factor is cal-
culated to aid in designing systems that conform to local regulations. Warnings and error messages notify the user when an array or a
specific accessory is outside safe working limits. For ground-stacked arrays, a tipping factor calculated from a complex set of variables
suggests whether an array design is likely to be stable, potentially unstable, or unsafe. Array statistics like array size, depth, and weight
are also calculated, and a PDF report facilitates system deployment. Mechanical data can be transferred to JBL’s Array Link TM app run-
ning on an iOS® or Android TM mobile phone using a QR code, with no need for internet connectivity. All relevant rigging information and
options are presented in an easy-to-understand layout.
CAUTION: All VTX systems should be designed and validated using the LAC-3 software application . This is the only
way to ensure that safe mechanical conditions are met for any given configuration .