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VTX A8 | User Manual
9 - VTX A8 PRESET LIBRARY
The VTX A8 preset library includes standard array and fill (FL) operating modes, along with full-range and 80Hz low-frequency process-
ing modes. The 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
Manager
TM
control software. Audio Architect presets are also available and can be downloaded from the JBL Pro website. Please see
below for a detailed description of VTX A8 operating modes and subwoofer processing options, and refer to the Preset Library setup
sheets for preset descriptions, memory locations and output channel assignments.
9.1 - VTX A8 PRESET MODES AND OPTIONS
Two preset modes and two low-frequency processing options are available:
VTX A8 FL: The FL presets (short for FILL) have nominally-flat frequency response and are to be used in situations where one or two A8
cabinets are appropriate, such as distributed front fills. With this preset, the acoustical low-frequency response of the system extends
down to 50Hz (full-range).
VTX A8 FL 80: The FL 80 presets have nominally-flat frequency response and are to be used in situations where one or two A8 cabinets
are appropriate, such as distributed front fills. With this preset, the acoustical low-frequency response of the system is set to 80Hz and
used when subwoofers are available.
VTX A8: This is the standard VTX A8 preset for array use. A high-frequency shelving response is applied to offset LF/MF array buildup
for nominally-focused arrays (equal enclosure site angle impact spacing over the desired audience coverage area). With this preset, the
acoustical low-frequency response of the system extends down to 50Hz (full-range).
VTX A8 80: This is the standard VTX A8 preset for array use with subwoofers. A high-frequency shelving response is applied to offset
LF/MF array buildup for nominally-focused arrays (equal enclosure site angle impact spacing over the desired audience coverage area).
With this preset, the acoustical low-frequency response of the system is set to 80Hz. The VTX A8 80 preset will generate the highest
A-weighted maximum sound pressure level.
TIP: The VTX A8 presets provide a well-balanced tonal starting point for a given array size. The Array Size Compensation
filter found in the JBL Line Array Control Panel (LACP) can be used to further fine-tune the tonal balance of an array for a
given array length. Please refer to the LACP section for more information.
9.2 - VTX B18 PRESET MODES AND OPTIONS
VTX B18 60: The 60Hz preset mode extends the upper frequency response of the B18 to 60Hz. The B18 60 presets is normally used
when 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 drive
rear-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 when
VTX 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-facing
B18 cabinets in cardioid configurations.
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