Line Array Calculator 3
Predict Your Design


Line Array Calculator 3
Line Array Calculator (LAC) is a simulation software intended for the design and prediction of JBL VTX Line Array systems and their acoustical performance. In addition, you can also use the software with flown and ground stacked JBL VTX Subwoofer Arrays. Beyond just acoustical prediction, you can use Line Array Calculator for mechanical validation and the calculation of all weight limits and safety warnings for JBL VTX Systems.

Line Array Calculator’s Enhanced Acoustical Modeling includes color SPL mapping, 0dB Isobar and SPL attenuation modes with frequency response and SPL based on JBL’s VTX DSP presets. With it, you can place up to 8 virtual microphones in the venue for accurate position-dependent response prediction. Additionally, the built-in Calculator is now updated with subwoofer modeling, allowing you to generate subwoofer delay values for electronic subwoofer array steering (EDS).

Mechanical Validation of single and dual-point array suspensions can now include weight limit calculations in real time. Array statistics are calculated that include array size, depth and weight and array design factors are calculated, that you can use to design arrays that meet local safety and regulation limits. Safety warning messages can also be provided when an unsafe configuration is selected.

Updates found in the new Line Array Calculator 3.0 include: a completely redesigned UI that’s both more intuitive and combined with an unlimited number of planes; more virtual measurement probes; frequency response averaging of multiple virtual measurements; and a brand-new subwoofer prediction mode. Multiple subwoofer clusters can now be entered into the display window and the software will predict broadband polar response of the entire array. With Line Array Calculator 3.0, system designers can now make more informed decisions about how subwoofer arrays should be placed in venues and aid in the optimization of these arrays for their best possible performance.
  • Acoustic prediction of JBL VTX Line Array Systems as well as flow and ground stacked subwoofer arrays
  • Support for 8 virtual measurement probes for predicting the frequency response of an array
  • New subwoofer prediction mode for acoustic prediction of ground stacked arrays with the ability to generate delay values for Electronic Delay Steering (EDS)
  • Built-in array optimization tools including the new JBL Array Size Compensation (ASC) filter
  • Full integration with JBL’s Performance Manager control software
  • Mechanical validation of arrays in real-time for single and dual-point suspension modes
  • Array statistics including array size, depth, weight and design factor


Please note: this prerelease Beta version of LAC-III is intended for early customer testing and validation only. The software is still under development and additional releases are planned to add features and address usability issues. Please address customer feedback or questions to:

Line Array Calculator 3

Offering accurate predictions in an efficient and time-conscious manner, the JBL Line Array Calculator platform supports all VTX line array products and is a critical link in the system design and prediction process.

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System Requirements

Supported Operating Systems:
  • 64-bit versions of Windows 7, Windows 8.1 or Windows 10

Minimum Performance Guidelines:
  • CPU: 64 bit dual core @ 2.0GHz or better
  • Memory: 2GB

LAC3 supported devices:
  • VTX A12
  • VTX V25-II / VTX V25-II-CS
  • VTX V20
  • VTX S25
  • VTX S28
  • VTX G28

New in Beta 2:

New Features:
  • Added support for the VTX A12 Suspension Bar for pullback applications

Bug Fixes:
  • Addressed several UI scaling issues on HiDPI displays
  • Addressed several issues related to switching units (Imperial Vs Metric)
  • Addressed a subwoofer spacing issue related to ground stack subwoofer arrays
  • Added dB and Frequency scales to the measurement graph
  • Average trace improvements in measurement graph window
  • Addressed "Min Pull Back Load" display issue for compression style system
  • The position of the frequency response probes can now be changed
  • The main LAC-III windows can be used even when the LACP panel is open
  • Compatibility improvements with Performance Manager version 2.4.1
  • Several visual UI improvements

New in Beta 1:

New Features:
  • Initial Beta release