JBL VTX B18 User Manual

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JBL VTX B18 User Manual Manual pdf 20 page image

20VTX B 18 | User Manual9 - VTX B18 PRESET LIBRARYThe VTX B18 preset library includes 60 and 80Hz operating modes along with cardioid presets for rear facing subwoofer enclosures.VTX presets are exclusively developed for Crown I-Tech HD amplifiers and come bundled with JBL HiQnet® Performance ManagerTMcontrol software. Audio Architect presets are also available and can be downloaded from the JBL Pro website. See below for a detaileddescription of the B18 operating modes and processing options, and refer to the Preset Library setup sheets for preset descriptions,memory locations and output channel assignments.9.1 - VTX B18 PRESET MODES AND OPTIONSVTX B18 60: The 60Hz preset mode extends the upper frequency response of the B18 to 60Hz. The B18 60 preset is normally usedwhen VTX full-range cabinets (like the A8 or A12) are used in full-range mode and minimal overlap between the subwoofers and full-range cabinets is desirable.VTX B18 60 REAR: The 60Hz rear preset was designed to work in conjunction with the standard B18 60 preset and used to driverear-facing B18 cabinets in cardioid configurations.VTX B18 80: The 80Hz preset mode extends the upper frequency response of the B18 to 80Hz. The 80Hz preset is normally used whenVTX full-range cabinets (like the VTX A8 or A12) are set to 80Hz, or when additional overlap between the full-range and subwoofer cab-inets is desirable.VTX B18 80 REAR: The 80Hz rear preset was designed to be work in conjunction with the stand B18 80 preset and used for rear-facingB18 cabinets in cardioid configurations.9.2 - TIME ALIGNMENTThe VTX B18 presets provide proper system summation with companion VTX full-range cabinets (all models) under physically coupledconfigurations (stacked or suspended) and when used with corresponding 60 or 80Hz presets. This pre-alignment is done at the factory,allowing any VTX subwoofer to be used with any VTX loudspeaker without needing specific subwoofer presets for each system andconfiguration. Additional time alignment delay should be added, as necessary, to account for physical path length differences betweensuspended full-range arrays and ground-stacked VTX subwoofers.VTX A8 VTX B18VTX A12