JBL VTX B18 User Manual
Also see for VTX Series: User manualUser manualRigging manualWiring guideUser manual
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Contents
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32VTX B 18 | User Manual13 - ELECTRONIC DELAY STEERING (EDS)When constructing large horizontal subwoofer arrays, the overall size of an array can have a negative impact on the subwoofer cover-age. The longer the array, the narrower the coverage. Electronic Delay Steering (EDS) is a technique used to alter the coverage angle ofa given subwoofer array by applying a specific, pre-calculated delay value to each subwoofer enclosure. The goal of EDS is to electron-ically alter the shape of a subwoofer array and widen the coverage pattern by creating a virtual arc. The radius of the arc controls theradiating pattern of the array and each delay value is carefully calculated to align all subwoofers to the virtual arc. Hybrid cardioid EDSsubwoofer arrays provide even horizontal coverage with 15—25 dB broadband SPL rejection behind the array.13.1 - EDS EXAMPLE - NO DELAYSThe example below shows the unaltered coverage of a horizontally distributed array of B18 subwoofers. Each B18 cluster, consists ofthree B18 enclosures with the bottom B18 facing backwards to create a 2:1 cardioid configuration. The center-to-center spacing of thearray was calculated at 2.5m (8.2’) which makes the total length of the array 18.3m (60’) long. Given the overall large size of the array,the array directivity increases, reducing the coverage to the center of the venue. The SPL Mapping below, was generated in LAC-3, anddemonstrate the coverage of this array at 50Hz.02468101214161820222426283032343638400 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88140135130125120115110105100B18Compact Single 18” SubwooferIN/OUT IN/OUTA BChannel SelectionSNB18Compact Single 18” SubwooferIN/OUT IN/OUTA BChannel SelectionSNB18Compact Single 18” SubwooferIN/OUT IN/OUTA BChannel SelectionSNB18Compact Single 18” SubwooferIN/OUT IN/OUTA BChannel SelectionSNB18Compact Single 18” SubwooferIN/OUT IN/OUTA BChannel SelectionSNB18Compact Single 18” SubwooferIN/OUT IN/OUTA BChannel SelectionSNB18Compact Single 18” SubwooferIN/OUT IN/OUTA BChannel SelectionSNB18Compact Single 18” SubwooferIN/OUT IN/OUTA BChannel SelectionSN |
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