JBL VTX A12 User Manual

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VTX A12 | User Manual199 - SUBWOOFER OPTIONSVTX A12 presets are designed for a 3:2 minimum cabinet ratio (A12 : VTX S28 or G28 subwoofers). The 3:2 ratioprovides sufficient headroom for both the subwoofers and the VTX A12s to reach MAX SPL (the limiters) at the sametime, while maintaining a minimum of 10dB SUB to TOP low-frequency contour. Other ratios can be used depending onthe desired tonal balance target, MAX SPL and application.A12VTX G28VTXS28VTX9.1 SUB / LF PRESET OPTIONSAs previously mentioned, there are two LF presets available for the A12 system: one is the VTX A12 (full range) preset,which extends the frequency response of the system down to 45Hz; the other is the VTX A12 80 (80Hz) preset, whichextends the frequency response of the system down to 80Hz. The VTX A12 (full range) preset is used when the systemis operated without subwoofers or when the application calls for extended LF response from the main arrays. If subwoof-ers are used, the A12’s LF region is overlapped with the subwoofers for additional output in the shared range. The VTXA12 80 (80Hz) preset is used only when subwoofers are available and when the highest A-weighted sound pressurelevel (SPL) is required. The same subwoofer preset option (i.e. VTX S28 80) is compatible for use with either the VTXA12 or VTX A12 80 preset, simplifying preset selection. When multiple A12 arrays are used (i.e. main and side arrays),all VTX A12 arrays should be operated in the same LF mode for headroom consistency.Example 1: A12 80 | SUB: 80 Example 2: A12 FR | SUB: 60 or 80Frequency (Hz)SPL (dB)20 100 1000-20-1001020Frequency (Hz)SPL (dB)20 100 1000-20-1001020SUB: 80HzSUB: 60Hz