JBL VTX B18 User Manual
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Contents
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29VTX B 18 | User Manual12 - FLOWN CARDIOID CONFIGURATIONSB18 subwoofers can be suspended in cardioid configurations using the VTX A8 suspension accessories like the VTX A8 Array Frame,the VTX A8 Mini Frame or the VTX A8 Suspension Bar. This chapter outlines good practices when using the B18 in flown cardioid con-figurations.12.1 - ARRAY CONFIGURATIONSWhen used in flown cardioid configurations, B18s should be used in blocks of 3 or 4, and when possible, in symmetric (top to bottom)arrangements. Symmetry ensures that the pattern produced by the array is axially symmetric with the physical array allowing for a morepredictable coverage and aiming. None symmetric arrangements can be created, but should always be modeled in LAC-III first to ensurethat the cancellation part of the array falls outside any of the audience areas.The example below shows the difference between a F-R-F and a F-F-R array. As shown in the SPL maps below, when a rear-facingsubwoofer is placed at the bottom of the array, the frontal coverage is tilted upwards and the rejection zone can fall within the audienceareas which can have undesirable effects.010203040506070800 20 40 60 80 100 120 140 1601401351301251201151101051009590858075010203040506070800 20 40 60 80 100 120 140 16014013513012512011511010510095908580Example 2 : 3x VTX B18 in an asymmetric configuration (front-front-rear)Example 1 : 3x VTX B18 symmetrically arranged (front-rear-front) |
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