JBL VTX Series Quick start guide

VTX B28 | Rigging Manual

VTX B28 | Rigging Manual
GENERAL INFORMATION
VTX B28 - Rigging Manual
Document Number: 1000346380
Version: A - EN
Distribution Date: July 13, 2020
Copyright © 2020 by HARMAN International; all rights reserved
JBL PROFESSIONAL
8500 Balboa Blvd
Northridge, CA 91329
USA

VTX B28 | Rigging Manual
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. VTX products draw on multiple JBL patents in driver, waveguide, and suspension
technology, as well as custom amplification, DSP, control, and system management designs created in collaboration with
HARMAN Professional sister companies.
VTX loudspeakers marry custom transducer design and in-house manufacture, breakthrough technologies, and a com-
prehensive system approach to deliver a premium experience for all who come into contact with it, from the FOH mixing
engineer to the systems engineer, rigger, road crew, warehouse manager, and, of course, the audience. Designed for
operators of portable and fixed systems alike, the VTX Series features JBL’s legendary sound quality coupled with expert
support and advanced tools that enable optimal specification, configuration, and operation of VTX systems in any venue,
anywhere in the world. The VTX Series delivers a comprehensive solution: the finest sound quality available, plus efficient
and intuitive setup, tuning, networking, and control.

VTX B28 | Rigging Manual
TABLE OF CONTENTS
1 - SAFETY .................................................................................................6
1.1 Safety Instructions ....................................................................................6
1.2 General Hardware Information ..........................................................................6
1.3 Attachment to Structures ...............................................................................6
1.4 Important Safety Warning ..............................................................................7
1.5 Are You New to Rigging? ..............................................................................7
1.6 Inspection and Maintenance ............................................................................7
1.7 Symbols ............................................................................................8
2 - MECHANICAL LIMITS .....................................................................................9
2.1 VTX B28 Limits - Suspended Array .......................................................................9
3 - SYSTEM COMPONENTS .................................................................................10
4 - SOFTWARE.............................................................................................11
4.1 Line Array Calculator 3 TM ................................................................................................11
4.2 Array Link TM ........................................................................................................................................................12
4.3 Ground-Stacked Arrays in LAC-3 .......................................................................13
5 - RIGGING SYSTEM .......................................................................................14
5.1 Overview ..........................................................................................14
5.2 The Rigging Mechanism ..............................................................................15
5.3 Connecting Cabinets Together ......................................................................17
5.4 Locked and Unlocked Example ......................................................................18
6 - TRANSPORTATION OPTIONS ..............................................................................19
6.1 Rotating the Dolly Tabs For Use With the ACC Dolly.........................................................20
7 - VTX B28 ACC DOLLY OVERVIEW ...........................................................................21
7.1 Attaching the VTX B28 ACC Dolly .......................................................................22
7.2 Stacking the ACC Dolly Boards ......................................................................23
7.3 Truck Packing with ACC...............................................................................24
8 - THE VERTICAL TRANSPORTER ............................................................................25
8.1 - VTX B28 VT Overview ................................................................................25
8.2 Installing VTX B28 Cabinets on the VT....................................................................26
8.3 VTX B28 VT CVR ....................................................................................27
8.4 Stacking the VTX B28 VT ..............................................................................28
8.5 Truck Packing with VT ................................................................................29
9 - THE VTX B28 SUSPENSION BAR ..........................................................................30
9.1 Suspension Bar Overview ...............................................................................................30

VTX B28 | Rigging Manual
9.2 Suspending B28 Arrays ...............................................................................31
9.3 Disassembling Arrays ................................................................................34
9.4 Suspension Bar Use cases ............................................................................36
9.5 Suspension Bar Safety Points ..........................................................................36
10 - THE VTX B28 GND ......................................................................................37
10.1 Attaching the VTX B28 GND ..........................................................................37
10.2 VTX B28 GND Examples .............................................................................38
11 - THE VTX A12 VT GND ...................................................................................39
11.1 Attaching the VTX A12 VT GND ........................................................................39
11.2 VTX B28 GND + VTX A12 VT GND Examples .............................................................41
12 - USING THE M20 POLE MOUNT ATTACHMENT ..............................................................42
13 - SPECIFICATIONS .......................................................................................43
13.1 VTX B28 SB .......................................................................................43
13.2 VTX B28 ACC ......................................................................................44
13.3 VTX B28 VT .......................................................................................45
13.4 VTX B28 GND......................................................................................46
14 - CONTACT INFORMATION ................................................................................47

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VTX B28 | Rigging Manual
1 - SAFETY
1.1 SAFETY INSTRUCTIONS
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not expose the product to direct rain or sea spray.
6. Clean only with a dry cloth.
7. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus that produce heat.
8. Only use attachments/accessories specified by the manufacturer.
9. Use only with a cart, stand, tripod, bracket, or table specified by the manufacturer or sold with the apparatus. When a cart is used,
use caution when moving the cart/apparatus combination to avoid injury from tip-over.
10. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as if
liquid has been spilled or objects have fallen into the apparatus, or if the apparatus has been exposed to rain or moisture, does not
operate normally, or has been dropped.
11. Contact JBL Professional for advanced servicing issues.
12. CAUTION - DO NOT PERFORM ANY SERVICING UNLESS YOU ARE QUALIFIED TO DO SO.
13. Prolonged exposure to excessive SPL can cause hearing damage. The loudspeaker is easily capable of generating sound pressure
levels (SPL) sufficient to cause permanent hearing damage to performers, production crew, and audience members. Caution should
be taken to avoid prolonged exposure to SPL in excess of 90 dB.
14. Read the System Rigging Manual before installation and use of the product.
1.2 GENERAL HARDWARE INFORMATION
Any hardware used in an overhead suspension application must be load rated for the intended use. Generally, this type of hardware
is available from rigging supply houses, industrial supply catalogs, and specialized rigging distributors. Local hardware stores do not
usually stock these products. Compliant hardware will be referenced with a working load limit (WLL) and a traceability code.
1.3 ATTACHMENT TO STRUCTURES
A licensed Professional Engineer must approve the placement and method of attachment to the structure prior to the installation of any
overhead object. The following performance standards should be provided to the Professional Engineer for design purposes: Uniform
Building Code as applicable, Municipal Building Code as applicable, and Seismic Code as applicable. The installation of the hardware
and method of attachment must be carried out in the manner specified by the Professional Engineer. Improper installation may result in
damage, injury, or death.

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VTX B28 | Rigging Manual
1.5 ARE YOU NEW TO RIGGING?
If you are new to rigging, you should:
• Know the rules for safe rigging.
• Attend a safe rigging seminar.
• Meet and establish a relationship with a licensed mechanical or structural engineer. Get in the habit of asking them questions in-
stead of assuming their answers. Learn from what they tell you.
• Research and understand the codes, practices and requirements of the venues where you intend to operate your sound system.
1.4 IMPORTANT SAFETY WARNING
The information in this section has been assembled from recognized engineering data and is intended for informational purposes only.
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.
All information presented herein is based upon materials and practices common to North America and may not directly apply to other
countries because of differing material dimensions, specifications, and/or local regulations. Users in other countries should consult with
appropriate engineering and regulatory authorities for specific guidelines.
Correct use of all included hardware is required for secure system suspension. Careful calculations should always be performed to
ensure that all components are used within their working load limits before the array is suspended. Never exceed the maximum recom-
mended load ratings.
Before suspending any speaker system, always inspect all components (enclosure, rigging frames, pins, eyebolts, track fittings, etc.) for
cracks, deformations, corrosion, or missing/loose/damaged parts that could reduce strength and safety of the array. Do not suspend
the speaker until the proper corrective action has been taken. Use only load-rated hardware when suspending JBL suspendable loud-
speaker models.
1.6 INSPECTION AND MAINTENANCE
Suspension systems are comprised of mechanical devices and, as such, require regular inspection and routine maintenance to ensure
proper functionality. Before suspending or pole mounting any speaker system, always inspect all components (enclosure, suspension
frames or brackets, pins, eyebolts, etc.) for cracks, deformations, corrosion, or missing/loose/damaged parts that could reduce strength
and safety of the array. Do not suspend or pole mount a speaker until the proper corrective action has been taken.
Installed systems should be inspected at least once a year. The inspection must include a visual survey of all corners and load-bearing
surfaces for signs of cracking, water damage, delamination, or any other condition that may decrease the strength of the loudspeaker
enclosure.
Accessory suspension hardware provided with or for VTX systems must be inspected for fatigue at least once a year or as required by
local ordinance. The inspection must include a visual survey of the material for signs of corrosion, bending, or any other condition that
may decrease the strength of the fastener. Additionally, any eyebolts must be checked for possible spin-out of the enclosure.
For all other hardware and fittings, refer to the hardware manufacturer’s inspection and maintenance guidelines for process.

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VTX B28 | Rigging Manual
1.7 SYMBOLS
The following symbols are used in this document:
CAUTION: This symbol gives notice of a potential risk of harm to the individual or the equipment. Instruction
marked with this symbol must be strictly followed.
TIP: This symbol gives notice of helpful, relevant information about the topic.
INSTRUCTIONS: This symbol gives notice of instructions that must be followed for proper installation and use of
the product.
TOOLS REQUIRED: This symbol gives notice of tools that must be used for proper installation and use of the
product.
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.
Prior to suspending the system, an expert, trained and experienced in suspending speaker systems, should inspect all parts and com-
ponents.

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VTX B28 | Rigging Manual
2 - MECHANICAL LIMITS
The VTX B28 suspension system and accessories comply with the 2006/42/EC Machinery Directive and have been designed following
the guidelines of DGUV regulation 17 (BGV-C1) for a minimum safety factor of 4:1. Minimum safety factor requirements for suspended
arrays are often set by local regulations. Use the JBL Line Array CalculatorTM software to check mechanical limits and ensure compliance
with local regulations. ANSI Standard E1.8 (Entertainment Technology Loudspeaker Enclosures Intended for Overhead Suspension),
Section 5.3.4, specifies a minimum safety factor of 5:1. If compliance with the ANSI standard is needed, make sure that the array design
produces a minimum safety factor of 5:1.
TERMINOLOGY:
Safe Limit: The safe limit provides the number of cabinets that can be used in an array while maintaining a safety factor of 4:1 or higher.
The safety factor of an array is determined by the number of cabinets, the array shape, and the overall array angle. An array constructed
within the safe limit will always yield a safety factor greater than 4:1 regardless of array parameters and conditions. Ground-stacked ar-
rays within the safe limit are stable under normal conditions. Designs exceeding the safe limit and up to the maximum limit, are possible,
but the JBL Line Array CalculatorTM software should be used to check mechanical safety for the given configuration.
Maximum Limit: Arrays larger than the maximum limit are not allowable under any conditions.
ARRAY FRAME NOTES SAFE LIMIT MAXIMUM LIMIT
VTX B28 SB Suspension Bar used as an Array Frame (top center) (16) B28 (16) B28
2.1 VTX B28 LIMITS - SUSPENDED ARRAY
NOTES:
• When the safe limit and maximum limit are the same, the array always produces a safety factor of 4:1 or higher.
• Safe and maximum limits are only applicable to the specified accessory (i.e. base plate or array frame). When several accessories
are combined (for example, ground-stacked arrays with a base plate and subwoofers underneath), the design should always be
evaluated and checked with LAC-3.
• LAC-3 will not allow array designs below the 4:1 minimum safety factor.
CAUTION: Limits for ground-stacked arrays always assume that the stacking surface (floor or stage) is flat . Do not
deploy ground-stacked arrays on non-flat surfaces to avoid tipping hazards .

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VTX B28 | Rigging Manual
3 - SYSTEM COMPONENTS
VTX B28 SB | Suspension Bar
VTX B28 VT | Vertical Transporter VTX B28 GND | Ground Stack
VTX B28
VTX B28 VT CVR | Soft Cover
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.
VTX B28 ACC | Dolly Board & Cover
VTX A12 VT GND | Ground Stack

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VTX B28 | Rigging Manual
4 - SOFTWARE
4.1 LINE ARRAY CALCULATOR 3 TM
Line Array Calculator 3 acoustical prediction software is used for the design and mechanical validation of VTX series line array systems.
Using LAC-3 is a three-step process. First, venue dimensions are defined using either X/Y/Z coordinates or the fast distance/angle
method. Second, array configurations are built from VTX loudspeaker models. Third, virtual measurement microphones and a suite of
built-in DSP functions are applied to make predictions of the system’s coverage and the linearity that will be delivered by the defined
array configuration in the specified space. Loudspeaker quantities and models, splay angles, and array aiming can be modified until
prediction shows that the desired coverage is attained throughout the venue. The built-in coverage-and-delay calculator determines
subwoofer delay values for electronic delay steering (EDS) that achieves optimal low frequency coverage.
Beyond acoustical predictions, LAC-3 validates the mechanical properties of arrays and selected JBL accessories. Configuration limits
are calculated in real time, for either suspended or ground-stacked arrays, based on array parameters such as the number of cabinets,
cabinet-to-cabinet splay angles, overall array aiming, and selected accessories. In the case of suspended arrays, a safety factor is cal-
culated to aid in designing systems that conform to local regulations. Warnings and error messages notify the user when an array or a
specific accessory is outside safe working limits. For ground-stacked arrays, a tipping factor calculated from a complex set of variables
suggests whether an array design is likely to be stable, potentially unstable, or unsafe. Array statistics like array size, depth, and weight
are also calculated, and a PDF report facilitates system deployment. Mechanical data can be transferred to JBL’s Array LinkTM app run-
ning on an iOS® or Android mobile phone using a QR code, with no need for Internet connectivity. All relevant rigging information and
options are presented in an easy-to-understand layout.
CAUTION: All VTX systems should be designed and validated using the LAC-3 software application. This is the only
way to ensure that safe mechanical conditions are met for any given configuration.

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VTX B28 | Rigging Manual
4.2 ARRAY LINK TM
JBL Array Link is a mobile companion app that works with LAC-3 software to assist technicians deploying VTX Series systems in the
field. Array Link uses a QR code to directly transfer mechanical data in real time from an array design created in LAC-3 to a mobile phone
running iOS® or Android™. All relevant rigging information and options are presented in an easy-to-understand layout. The application
can be downloaded free from the Apple App Store or Google Play Store.
Once the system designer or lead tech computes the angles for each hang in LAC-3, every member of the crew can get the correct
information for angles, attachment points, trim height, etc., either by scanning the QR code from LAC-3 directly with their device, or
getting the data from a copy shared on another user’s device. When all users onsite have the configuration data, arrays can be deployed
quickly and efficiently.

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VTX B28 | Rigging Manual
4.3 GROUND-STACKED ARRAYS IN LAC-3
Line Array Calculator version 3.5.0 or later includes mechanical safety checks for ground-stacked arrays. The software takes into con-
sideration several variables that can affect the stability of an array, including outside factors such as someone pushing on an array.
Based on this data, LAC-3 generates a safety assessment factor and notifies the user of potential mechanical or stability problems.
Errors and warnings generated fall into one of the following categories:
No errors or messages
In this case, the array is stable under normal conditions and can be used as is. The array
also complies with the mechanical limits set by JBL for the speakers and selected acces-
sories.
WARNING: Stability Hazard! - Stack Could Become Unstable - Secure to Ground
This message is an alert that the array is potentially unstable and a tipping hazard condition
has been detected. The user is responsible for securing the array to the ground, stage, or
other structure that can provide additional support and is rated for the weight of the array.
This message may also be warning of external factors that can influence stability, such as
someone accidentally pushing the array.
Configuration exceeds the maximum number of boxes allowed
This message is presented when the specified array design exceeds the mechanical limits
set by the JBL team for the speakers or selected accessories. Array designs that trigger this
message should not be used under any conditions, as they can lead to hardware damage
and/or injury.
Center of Gravity
Invalid CG Location
This message is presented when the Center of Gravity of an array design exceeds the foot-
print of the selected accessory. Array designs that trigger this message should not be used
under any conditions, as they can lead to hardware damage and/or injury.

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VTX B28 | Rigging Manual
5 - RIGGING SYSTEM
The B28 uses a simple two-point rigging system capable of suspending arrays of up to 16 B28 enclosures. Rigging components are
hidden behind the wooden side panels, and the link bars are deployed by a spring-loaded mechanism. A unique, all-captive locking
system secures cabinets together using a set of levers and sliding pins. The mechanism includes a safety lock to prevent unintentional
release, and complies with all safety requirements. When B28 cabinets are ground stacked, the all-captive design keeps unused parts
hidden and damped from rattling. The B28 rigging system and enclosure is front-to-back symmetric, ideal for creating flown or ground-
stacked arrays, in omnidirectional or cardioid configurations.
5.1 OVERVIEW
M20 POLE AND BASE PLATE
ATTACHMENT`
INTERLOCKING
PROTECTIVE GLIDE
LINK-BAR
MECHANISM
REVERSIBLE DOLLY
ATTACHMENT TAB
LOCK
MECHANISM

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VTX B28 | Rigging Manual
5.2 THE RIGGING MECHANISM
The B28 rigging system consists of two main mechanisms, one at the top (A) and one at the bottom of the enclosure (B). The mechanism
at the top extends the link bar for connection to another cabinet. The lower mechanism locks B28 subwoofers together.
A B
A
B
• The top mechanism is spring-loaded; the RED lever releases the link bar. To extend the link bar, move the RED lever up until the
mechanism releases. Once extended, the link bar remains in the extended position until the user manually retracts it for storage
or transportation. To retract the link bar, simply press the top of the bar down until the RED lever moves back to the lower position
and a “clack” sound is heard. Note that the RED lever is used only to extend the bar, not to retract it.
A

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VTX B28 | Rigging Manual
When cabinets are stacked together, the top of the link bar is not accessible. In this situation, the bar is lowered using a finger notch on
the side of the cabinet.
• The lower mechanism secures B28 cabinets together. The mechanism is controlled by the RED lever, which moves a pin through
the link bar of the cabinet below. A safety button prevents unintentional disengagement of the pin. The default position is down
(locked). To retract the pin, first press down the safety button, then push the RED lever up. The lock is then disengaged, and the
cabinet ready to connect to another B28. Move the lever back to the lower position to close the lock.
B
TO UNLOCK:
• Press and hold down the BLACK button.
• Move the RED lever up.
1
2
TO LOCK:
• Move the RED lever down.
1
1
2 1

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VTX B28 | Rigging Manual
5.3 CONNECTING CABINETS TOGETHER
CAUTION: Always ensure that locks are fully seated and that both sides of the B28 rigging are deployed and en-
gaged before lifting.
STEPS:
• Stack the cabinets.
• Open the LOCK of the top B28.
• Extend the link bar.
• Close the lock.
1
2
3
4
1
2
3
4

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VTX B28 | Rigging Manual
UNLOCKED
LOCKED
5.4 LOCKED AND UNLOCKED EXAMPLE
LOCKING PIN

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VTX B28 | Rigging Manual
6 - TRANSPORTATION OPTIONS
B28 subwoofers can be transported singly or in stacks. The VTX B28 VT Vertical Transporter cart allows transporting stacks of up to
four B28 subwoofers. When stacked in blocks of two, three, or four, B28 cabinets can be transported in either front-firing or cardioid
configurations. The VTX B28 VT CVR, a reinforced cover, is available for protecting subwoofers during transportation. The VT option is
ideal for large-scale touring situations where large format trucks are used and maximum deployment efficiency is needed. Single B28
cabinets can be transported using the VTX B28 ACC accessory kit, which includes a front-face dolly and a protective cover. The ACC
option is more agile and efficient for transportation, as it allows stacking B28 subwoofers on top of other equipment in the trucks.
VTX B28 VT
VTX B28 ACC

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VTX B28 | Rigging Manual
STEPS:
• Remove the four M6 HEX bolts holding the bracket onto the B28.
• Rotate the bracket to the extended position.
• Install the bolts.
• Repeat for the other side.
1
2
TOOLS REQUIRED: A Torx T25 wrench is required to remove the four bolts holding the ACC brackets. All bolts should
be torqued to 2.82 N.m (25 in.lbs).
6.1 ROTATING THE DOLLY TABS FOR USE WITH THE ACC DOLLY
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. This orientation is ideal when B28s are on a vertical transport cart, where the
tabs are not needed, but the tabs must be rotated to attach a front-face dolly board to the B28.
3
4
1
2 2 3
4