JBL Professional VTX-LZ-K18 September 2012
What is it? A laser accessory kit for precision alignment of VTX Series line arrays for optimum performance and audience coverage. Details The VTX-LZ-K includes two VTX-LZ laser units and one rechargeable VTX-LZ-PS power supply. The VTX-LZ employs a Class-3R green laser (less than 5mW, 532nm wavelength) said to be approximately 20 times more visible than a red laser over long distances. The VTX-LZ connects to the VTX-LZ-PS power supply by means of a standard XLR cable and multiple lasers can be daisy-chained. The laser units are factory-calibrated, weather-resistant and feature fan-cooling and on/off cycling for extended laser life. VTX-LZ laser units can be mounted on either side of the VTX enclosure suspension frame and are secured using a quick-release locking pin. The lasers are centred on the middle of the enclosure and provide an accurate site angle reference in accordance with JBL Line Array Calculator II (LAC II) software predictions. When mounted on the top enclosure of a VTX line array, the VTX-LZ laser provides a visual reference to confirm the on-axis vertical site angle of the array while also providing an azimuth indication so that relative horizontal pan angles can be matched for FOH left-right arrays. Once SPL and frequency response has been optimised on a circuit level, global equalisation can then be applied to the entire array to compensate for room-related effects. For this step, array equalisation can be based on the spatial average of all measurement microphones placed throughout the audience area with reference to VTX-LZ laser aiming locations. This patented approach to system measurement and tuning has been specifically designed into the workflow of JBL’s HiQnet Performance Manager control software, Performance Manager. And another thing… For advanced system tuning, multiple LZ lasers can be deployed to serve as site angle references for individual array circuits, assisting in physical measurement microphone placement to correspond with virtual measurement microphones shown in LAC.