JBL VTX Series User Manual
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JBL VTX Series User Manual

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VTX B28 | User Manual

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  • Page 1 VTX B28 | User Manual...
  • Page 2 VTX B28 | User Manual GENERAL INFORMATION VTX B28 User Manual Document Number: 1000346379 Version: A - EN Distribution Date: July 24, 2020 Copyright © 2020 by HARMAN International; all rights reserved JBL PROFESSIONAL 8500 Balboa Blvd Northridge, CA 91329...

  • Page 3: Line Array Calculator

    Thank you for purchasing JBL VTX Series products In more than 75 years of JBL innovations, the VTX Series stands apart as a milestone in the practical application of cre- ative engineering. VTX products herald the next generation in line array loudspeaker systems: a new era in performance, system integration and user friendliness.

  • Page 4: Table Of Contents

    VTX B28 | User Manual T ABLE OF CONTENTS 1 - SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.1 Safety Instructions .
  • Page 5 VTX B28 | User Manual 10.2 Minimum Space Between Cardioid Stacks ............. . . 23 10.3 Minimum Space from a Wall .

  • Page 6: Safety

    11. Contact JBL Professional for advanced servicing issues. 12. CAUTION - DO NOT PERFORM ANY SERVICING UNLESS YOU ARE QUALIFIED TO DO SO.

  • Page 7: Important Safety Warning

    None of the information in this section should be used without first obtaining competent advice with respect to applicability to a given circumstance. None of the information presented herein is intended as a representation or warranty on the part of JBL. Anyone making use of this information assumes all liability arising from such use.

  • Page 8: Symbols

    VTX B28 | User Manual JBL is not responsible for the application of its products for any purpose or the misuse of this information for any purpose. Furthermore, JBL is not responsible for the abuse of its products caused by avoiding compliance with inspection and maintenance procedures or any other abuse.

  • Page 9: System Components

    VTX B28 | User Manual 2 - SYSTEM COMPONENTS VTX B28 Fault Menu/Exit Thermal 1 2 3 4 Power Bridge 1/2 Clip Prev Bridge 3/4 Data DRIVECORE SERIES Signal Next Ready Fault Fault Thermal Thermal Power Bridge 1/2 Clip Clip Bridge 3/4 Data Signal...

  • Page 10: Compatible Accessories

    VTX B28 | User Manual 3 - COMPA TIBLE ACCESSORIES The accessories listed below are compatible with the VTX B28. For more detailed information about the B28 accessories refer to the VTX B28 Rigging Manual found at www.jblpro.com. 3.1 VTX B28 SB - SUSPENSION BAR •...

  • Page 11: Vtx B28 Acc - Accessory Cover And Caster Board

    Attaches directly to B28 integral rigging • Simple two-part design • Lightweight CAUTION: Always use components and accessories specified and approved by JBL Professional . When a cart is used, use caution when moving the cart to avoid injury from tip-over .

  • Page 12: Software

    Array Link is a mobile companion app that works in conjunction with LAC software to assist in deployment of VTX Series systems. Array Link uses a QR code system to transfer all mechanical ar- ray information from the main LAC application to a mobile phone.

  • Page 13: Overview

    The VTX B28 features two JBL 2288H-M 18-inch woofers engineered for improved linearity, efficiency, and extra-long excursion. The 2288M employs Differential Drive – JBL’s dual voice coil, dual gap technology – to deliver bet- ter heat dissipation, lower power compression, and wider dynamic range than conventional single-coil designs. The B28 incorporates a double-flared, exponential, low frequency port design to improve airflow and reduce audible turbulence, even at high output levels.

  • Page 14: Connections

    VTX B28 | User Manual 6 - CONNECTIONS The VTX B28 is equipped with two Neutrik NL4 speakON connectors, one on the rear of the cabinet and one on the front. The 18-inch woofers inside the B28 are wired in parallel from pins 1+/1- of the NL4 connectors. Since this results in a nominal load of 4 ohms, dai- sy-chaining subwoofers is not recommended.

  • Page 15: Transportation Options

    B28 subwoofers on top of other equipment in the trucks. VTX B28 VT VTX B28 ACC TIP: For additional information on how to use and deploy the ACC and Vertical Transporter refer to the VTX B28 Rigging Manual, which can be downloaded from the JBL Professional website.

  • Page 16: Rotating The Dolly Tabs For Use With The Acc Dolly

    VTX B28 | User Manual 7.1 ROT A TING THE DOLL Y T ABS FOR USE WITH THE ACC DOLL Y Two dolly tabs at the front of the B28 are used to secure the front-face ACC dolly board to the B28. The tabs are retractable and ship from the factory in the retracted position inside the B28.

  • Page 17: Vtx B28 Preset Library

    Audio Architect presets are also available and can be downloaded from the JBL Pro website. See below for a detailed description of the B28 operating modes and processing options, and refer to the Preset Library setup sheets for preset descriptions, memory locations and output channel assignments.

  • Page 18: System Amplification & Wiring

    RMS limiting, and long-term thermal protection for the woofers. The I-Tech HD amplifiers also offer a user-adjustable input section for equalization, time alignment, and electronic delay steering. Standard JBL presets are available for both the Crown I-Tech 4x3500HD and I-Tech 12000HD. The most up-to-date presets are available for download from www.jblpro.com, and bundled in the latest version of Performance Manager control software.

  • Page 19: B28 Using I-Tech 4X3500Hd

    When using Crown I-Tech 4x3500HD amplifiers, up to two VTX B28 subwoofers can be powered per amplifier and the remaining chan- nels can be used to power a JBL full-range speaker, such as the VTX A8. The example below illustrates how to connect two VTX B28 cabinets to a four-channel I-Tech HD amplifier using standard NL4 (or NL2) cables.

  • Page 20: Crown V-Rack

    9.3 CROWN V-RACK VTX Series systems are compatible with the Crown V-Rack 12000HD and Crown V-Rack 4x3500HD touring racks. The number of cab- inets supported by each amplifier and wiring options remain the same as the Crown I-Tech examples illustrated in this document. For...

  • Page 21: Cardioid Configurations

    VTX B28 | User Manual 10 - CARDIOID CONFIGURA TIONS The directivity of a subwoofer is understood to be omnidirectional, meaning that it projects energy equally in all directions. In reality, most subwoofers do exhibit some front-to-back directivity (about 1 to 3 dB, depending on the frequency), but not enough to have any meaningful impact.

  • Page 22: Recommended Cardioid Setups

    VTX B28 | User Manual 10.1 RECOMMENDED CARDIOID SETUPS B28 subwoofers can be used in a number of ground stacked or flown cardioid configurations depending on available space and the number of cabinets available. Cardioid configurations are typically differentiated by the ratio of front-facing to rear-facing cabinets, the spacing between stacks, and the position of rear-facing subwoofers within the stacks.

  • Page 23: Minimum Space Between Cardioid Stacks

    VTX B28 | User Manual As previously discussed, subwoofers do exhibit some front-to-back directivity, resulting in 1 to 3 dB of natural rear rejection. This is taken into consideration in the factory presets, and is the reason 2:1 is the most effective ratio. A 1:1 ratio supplies less rejection than 2:1 or 3:1, and should be avoided whenever possible.

  • Page 24: Minimum Space From A Wall

    VTX B28 | User Manual 10.3 MINIMUM SPACE FROM A W ALL When cardioid subwoofer stacks are placed in front of a high-mass structure, like a concrete wall or stage, rear radiation patterns can be disrupted. Allow at least 5 feet (1.5 meters) of space behind the array for the cardioid effect to develop.

  • Page 25: Flown Array Configurations

    VTX B28 | User Manual 10.4 FLOWN ARRA Y CONFIGURA TIONS Subwoofers in flown cardioid arrays should be configured in 2:1 or 3:1 building blocks and, when possible, in arrangements that are symmetrical, top to bottom. Symmetry ensures that the pattern produced by the array is axially symmetric with the physical array, al- lowing more predictable coverage and aiming.

  • Page 26: Cardioid Presets In Performance Manager

    VTX B28 | User Manual 11 - CARDIOID PRESETS IN PERFORMANCE MANAGER Performance Manager software allows selection of the appropriate factory preset for any subwoofer configuration. Each amplifier chan- nel can run its own preset, enabling implementation of the configuration and layout needed for each situation. STEPS: •...

  • Page 27: Testing The Vtx B28

    VTX B28 | User Manual 12 - TESTING THE VTX B28 As with all speakers, the VTX B28 must be checked and maintained periodically in order to assure long-term performance. While the system is designed to exhibit the utmost reliability, ensuring optimal performance for years to come requires confirming that the B28 is operating within specified tolerances.

  • Page 28: Using Performance Manager

    VTX B28 | User Manual 12.2 USING PERFORMANCE MANAGER When in the field, Performance Manager’s Test System Mode can be used to test VTX systems. This method is quick, and especially useful for determining whether all speaker cables, including cabinet-to-cabinet NL jumpers, are properly functioning. To perform the test, Performance Manager uses the I-Tech HD’s built-in noise generator, in conjunction with the amplifier’s capabilities to sense voltage and current draw, to generate a nominal load impedance reading for each amplifier output channel.

  • Page 29: Specifications

    JBL continually engages in research related to product improvement. Some materials, production methods and design refinements are introduced into existing products without notice as a routine expression of that philosophy. For this reason, any current JBL product may differ in some respect from its published description, but will always equal or exceed the original design specifications unless otherwise stated.

  • Page 30: Acoustic Measurements

    VTX B28 | User Manual 14 - ACOUSTIC MEASUREMENTS FREQUENCY RESPONSE 1000 10000 20000 Frequency (Hz) VTX B28 60 VTX B28 80 15 - DIMENSIONS 1324 mm (52.1 in) 750 mm (29.5 in) 508 mm (20.0 in) 512 mm (20.2 in)

  • Page 31: Contact Information

    +1 (844) 776-4899 www.jblpro.com PROFESSIONAL CONT ACTS, OUTSIDE THE U.S.A.: Contact the JBL Professional distributor in your area. A complete list of JBL Professional international distributors is provided at our U.S.A. website: www.jblpro.com HARMAN Professional EMEA HARMAN Professional APAC...

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