JBL VTX Series User manual

VTX A8| User Manual

VTX A8| User Manual
GENERAL INFORMATION
VTX A8 - User Manual
Document Number: 1000337283
Version: A - EN
Distribution Date: 08/25/2018
Copyright © 2018 by HARMAN International; all rights reserved
JBL PROFESSIONAL
8500 Balboa Blvd
Northridge, CA 91329
USA

VTX A8| User Manual
Thank you for purchasing JBL VTX Series products
Of all the achievements JBL has made over the years, the VTX Series stands as a milestone in the practical application
of creative engineering. The next generation in line arrays, VTX heralds a new era in performance, system integration and
user friendliness. Supported by multiple patents in driver, waveguide and suspension technology, VTX is also supported
by technologies from HARMAN Professional sister companies for amplification, DSP, control and system management. In
addition to high-performance components, VTX is backed by JBL’s engineering support — the human factor and technical
tools that are key to the proper specification and configuration of the VTX system in any venue, anywhere in the world.
The VTX Series is a result of JBL’s continued effort to deliver more powerful, more compact, lightweight and flexible
sound reinforcement systems. Designed for portable and fixed-venue system operators alike, VTX features JBL’s legend-
ary sound quality coupled with the most advanced sound reinforcement technology and support available. As a member
of the HARMAN group, we draw from the expertise and integration of the entire range of HARMAN Pro audio technologies.
So, in addition to the best sound possible, VTX offers efficient and intuitive setup, tuning, networking and control to provide
a truly professional and advanced system solution.

VTX A8| User Manual
TABLE OF CONTENTS
1 - DECLARATION OF CONFORMITY ...........................................................................7
2 - SAFETY .................................................................................................8
2.1 - Safety Instructions ...................................................................................8
2.2 - General Hardware Information ..........................................................................8
2.3 - Important Safety Warning .............................................................................8
2.4 - Inspection and Maintenance ...........................................................................9
2.5 - Attachment to Structures ..............................................................................9
2.6 - Symbols ..........................................................................................10
3 - SYSTEM COMPONENTS .................................................................................11
4 - COMPATIBLE ACCESSORIES..............................................................................12
4.1 - VTX A8 AF - Array Frame .............................................................................12
4.2 - VTX A8 AF EB - Array Frame Extension Bar ..............................................................12
4.3 - VTX A8 MF - Mini Frame..............................................................................12
4.4 - VTX A8 SB - Suspension Bar ..........................................................................13
4.5 - VTX A8 VT - Vertical Transporter .......................................................................13
4.6 - VTX A8 VT CVR - Soft Cover ..........................................................................13
4.7 - VTX A8 BP - Base Plate ..............................................................................13
4.8 - VTX NL824 - Breakout Cable ..........................................................................14
4.9 - VTX RC500 - Rotating Clamp ..........................................................................14
4.10 - VTX Delta - Delta Plate ..............................................................................14
5 - SOFTWARE.............................................................................................15
5.1 - Line Array Calculator 3 TM .............................................................................15
5.2 - Array Link TM .......................................................................................15
5.3 - Performance Manager TM .............................................................................15
6 - INTRODUCTION .........................................................................................16
6.1 - VTX A8 ...........................................................................................16
6.2 - VTX B18 ..........................................................................................17
7 - CONNECTIONS .........................................................................................18
7.1 - A8 Internal Wiring ...................................................................................19
7.1 - B18 Internal Wiring ..................................................................................19
8 - SYSTEM AMPLIFICATION & WIRING ........................................................................20
8.1 - A8 on Crown I-Tech 4x3500HD and NL4 Cables ...........................................................20
8.2 - A8 on Crown I-Tech 4x3500HD and NL8 Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8.3 - A8 on Crown I-Tech HD (2-CH).........................................................................21

VTX A8| User Manual
8.2 - B18 on Crown I-Tech 12000HD ........................................................................22
8.2 - B18 on I-Tech 4x3500HD .............................................................................23
8.3 - Crown Audio V-Rack.................................................................................23
9 - VTX A8 PRESET LIBRARY.................................................................................24
9.1 - VTX A8 Preset Modes and Options .....................................................................24
9.2 - VTX B18 Preset Modes and Options ....................................................................24
10 - SUBWOOFER OPTIONS .................................................................................25
10.1 SUB / LF Preset Options..............................................................................25
10.4 - Time Alignment ....................................................................................26
11 - CONFIGURATION EXAMPLES ............................................................................27
11.1 - Small size A8 System ...............................................................................27
11.2 - Medium size A8 System .............................................................................27
11.2 - Large Size A8 System ...............................................................................28
11.2 - Large A8 - A12 System ..............................................................................28
11 - FREQUENCY RESPONSE ................................................................................29
12 - LINE ARRAY CONTROL PANEL ...........................................................................30
12.1 - Accessing LACP ...................................................................................30
12.2 - Filter 1 - Array Size Compensation ....................................................................31
12.3 - Filter 2 - Atmospheric Absorption Compensation .........................................................31
12.4 - Filter 3 - HF Throw Distance Compensation..............................................................31
12.5 - Filter 4 & 5 - User PEQ 1 & 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
12.6 - Example using LACP ...............................................................................32
13 - TESTING VTX A8 .......................................................................................33
13.1 - Using a DMM (Digital Multi Meter) .....................................................................33
13.1 - Testing Individual components .......................................................................34
13.2 - Using Performance Manager .........................................................................35
13.3 - Performance Manager Readings ......................................................................35
14 - SPECIFICATIONS .......................................................................................36
14.2 - VTX A8 ..........................................................................................36
14.2 - VTX B18 .........................................................................................37
15 - ACOUSTIC MEASUREMENTS ............................................................................38
15.1 - VTX A8 ..........................................................................................38
15.2 - VTX B18 .........................................................................................38
16 - DIMENSIONS ..........................................................................................39
16.1 - VTX A8 ..........................................................................................39

VTX A8| User Manual
16.2 - VTX B18 .........................................................................................39
17 - CONTACT INFORMATION ................................................................................40

VTX A8| User Manual
1 - DECLARATION OF CONFORMITY
Frank Lacelle
Compliance Manager - Harman International
BRAND: JBL Professional
FAMILY NAME: VTX A8/B18 loudspeaker and suspension accessories
• VTX A8
• VTX A8 AF
• VTX A8 AF EB
• VTX A8 MF
• VTX A8 SB
• VTX A8 BP
MODEL NAMES:
We, HARMAN International, declare under our sole responsibility that the product, to which this declaration relates, is in conformity
with the following standards:
STANDARD DESCRIPTION TEST AGENCY
2006/42/EC
MACHINE DIRECTIVE
Applies to machinery and lays down essential
health and safety requirements
ISO12100
Tested at JBL Professional
2014/35/EC
LOW VOLTAGE DIRECTIVE
Applies to loudspeaker and lays down essential
health and safety requirements.
EN60065
Tested at JBL Professional
• VTX RC500
• VTX A8 VT
• VTX B18
• VTX B18 VT
• VTX B18 ACC

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VTX A8| User Manual
2 - SAFETY
Before using a JBL VTX Series system, please review the following for important information on safety and protection of your investment.
2.1 - 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 liquid has been spilled or objects have fallen into the apparatus, 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 pres-
sure 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
2.2 - 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 usu-
ally stock these products. Hardware that is intended for overhead suspension will comply with ASME B30.20 and will be manufactured
under product traceability controls. Compliant hardware will be referenced with a working load limit (WLL) and a traceability code.
2.3 - 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

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VTX A8| User Manual
2.4 - INSPECTION AND MAINTENANCE
Suspension systems are comprised of mechanical devices and, as such, they require regular inspection and routine maintenance to
ensure proper functionality. Before suspending or pole mounting any speaker system, always inspect all components (enclosure, sus-
pension 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 the speaker until the proper corrective action has been taken.
Installed systems should be inspected at least annually. The inspection shall include a visual survey of all corners and load-bearing
surfaces for signs of cracking, water damage, de-lamination 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 annually or as required by local
ordinance. The inspection shall 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 shall 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.
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.
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.
2.5 - 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 A8| User Manual
2.6 - SYMBOLS
The following set of 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.

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VTX A8| User Manual
3 - SYSTEM COMPONENTS
VTX A8 VTX B18
VTX S28 VTX G28
Crown I-Tech HD Amplifiers Crown Audio V-Rack
Menu/Exit
Prev
Next
Power
Bridge 1/2
Bridge 3/4
Data
DRIVECORE SERIES
Fault
Thermal
Clip
-10
-20
Signal
Ready
1234
Fault
Thermal
Clip
-10
-20
Signal
Ready
1
Power
Bridge 1/2
Bridge 3/4
Data
Menu/Exit Prev Next
Fault
Thermal
Clip
-10
-20
Signal
Ready
2
12

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VTX A8| User Manual
PRELIMINARY
4.1 - VTX A8 AF - ARRAY FRAME
• Compatible with VTX A8 and VTX B18
• Maximum Limit: 24 x VTX A8 / 13 x VTX B18
• 0.5° pick-point resolution
• Built-in storage position for extension bar
• Includes 1 x VTX A8 AF EB extension bar
• Support for 3rd-party laser inclinometers
• Compatible shackle size: 5/8”
4.2 - VTX A8 AF EB - ARRAY FRAME EXTENSION BAR
• Extension Bar for use with VTX A8 AF
• Single, front-to-back or side-by-side pick point options
• Includes 3 x shackles and mounting brackets
• Compatible shackle size: 5/8”
4 - COMPATIBLE ACCESSORIES
All listed accessories are compatible with the VTX A8 and in some case the VTX B18. For B18 specific accessories refer to the VTX B18
User and Rigging manuals found at www.JBLpro.com.
4.3 - VTX A8 MF - MINI FRAME
• Compatible with VTX A8 and VTX B18 enclosures
• Maximum Limit: 8 x VTX A8 / 3 x VTX B18
• Single-point and side-by-side pick-point options
• 3-part collapsible design
• Compatible shackle size: 1/2”

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VTX A8| User Manual
4.5 - VTX A8 VT - VERTICAL TRANSPORTER
• Vertical transport cart for 4 x VTX A8 enclosures
• Truck-friendly dimensions
• Includes a hard top (VT-TOP)
• Built-in stacking features for easy storage
• Heavy-duty casters
4.6 - VTX A8 VT CVR - SOFT COVER
• Heavy-duty soft cover for VTX A8 enclosures
• Covers 4 x VTX A8 enclosures on a VTX A8 VT
• Includes input-panel flaps for testing purposes
• Clear see-through pocket for shipping labels
• Handle cut-outs for easy transportation
• Folds and stores in the VTX A8 VT
4.7 - VTX A8 BP - BASE PLATE
• Used for ground stacking VTX A8
• Maximum Limit: 8 x VTX A8 cabinets
• Connects VTX A8 cabinets to subwoofers
• Universal M20 attachment method
• Tilt range: -15° to +5°
4.4 - VTX A8 SB - SUSPENSION BAR
• Compatible with VTX A8 and VTX B18
• Maximum Limit: 24 x VTX A8 / 16 x VTX B18
• Used for pull-back applications
• Shackle Size: 5/8”
COMING SOON
PRELIMINARY

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VTX A8| User Manual
4.10 - VTX DELTA - DELTA PLATE
• Universal delta plate accessory for VTX systems
• Allows for +/- 10 degree horizontal adjustments
• Includes 3 x 5/8” shackles
• Working Load Limit: 2,177kg (4,800lbs)
4.8 - VTX NL824 - BREAKOUT CABLE
• NL8 to 2 x NL4 Breakout cable
• 1.5m (5’) long
• High-quality STX Neutrik connectors
• 4 x 2.5mm2 speaker cable
• Simplifies wiring for Bi-Amplified systems
• Comes with JBL branded cable strap
4.9 - VTX RC500 - ROTATING CLAMP
• Universal truss/pipe clamp adapter
• Working Load Limit: 500 kg (1100 lbs)
• Adjustable clamping mechanism
• Pipe range: 1” – 2.0”
• Includes bearing for smooth 360° rotation
• 10° rotation marks for horizontal array aiming
TIP: For B18 specific accessories refer to the VTX B18 User and Rigging manuals found at www.JBLpro.com.
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.
COMING SOON
COMING SOON
PRELIMINARY

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VTX A8| User Manual
5.1 - LINE ARRAY CALCULATOR 3 TM
LAC is a simulation software for designing and predicting JBL VTX
Series systems. LAC predicts the acoustical performance of line
array systems, as well as flown and ground stacked subwoofer ar-
rays. Subwoofer delay values can be generated for electronic delay
steering (EDS) using the built-in coverage calculator. Beyond the
acoustical prediction, LAC is used for mechanical validation of all
used hardware and calculating weight limits and safety warnings.
www.jblpro.com/lac3
5 - SOFTWARE
5.2 - ARRAY LINK TM
JBL Array Link is a mobile companion app that works in conjunc-
tion with JBL’s LAC software to assist with deploying JBL VTX
Series systems. Array Link uses a QR code system to transfer all
mechanical array information from the main LAC application to a
mobile phone. All relevant rigging and mechanical options are pre-
sented in an easy-to-understand layout. The application is com-
patible with iOS® and AndroidTM and can be obtained from the
respective app stores.
5.3 - PERFORMANCE MANAGER TM
JBL® Performance Manager™ is a software application designed
to configure and control networked audio systems. The workflow
paradigm of the Performance Manager interface guides the system
designer through the complete system design, configuration and
control process. A dedicated show mode provides all the moni-
toring and control needed to have a complete picture of how the
system is performing in real time.
www.jblpro.com/performancemanager

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VTX A8| User Manual
6 - INTRODUCTION
6.1 - VTX A8
The VTX A8 is a next-generation line array element that delivers JBL Professional’s flagship VTX A Series technology in a compact solu-
tion for small to mid-size rental and installed applications. The VTX A8 was designed to solve the diverse sound reinforcement needs
of production companies, rental houses, theaters, houses of worship, as well as production applications requiring front fills, side arrays
or other auxiliary support for larger-scale VTX systems. Proprietary JBL woofers and our latest-generation high-frequency transducer
and waveguide technology, provides unmatched performance, efficiency, and a consistent 110-degrees of horizontal coverage. The
A8 combines two 8” woofers, four 3.5” midrange drivers and two 2” high-frequency drivers in a single low-profile cabinet. Proprietary
double-flared low-frequency ports, precisely calculated for greater low-frequency performance extend the usable operating range down
to 49Hz. The VTX A8 shares the VTX A Series’ patented rigging mechanism and suspension system for streamlined deployment, while
a comprehensive suite of accessories open up a world of configuration options.
INSIDE THE INNOVATIONS
For VTX A8, next-generation transducers were engineered from the
ground up by JBL to match the physical characteristics of its com-
pact enclosure. Custom-designed low and mid-frequency sections
along with flagship VTX A-Series 2” compression drivers deliver
higher output, lower distortion and greater low-frequency extension.
Physical design refinements integrate more drivers in a smaller, light-
er cabinet, for maximum output in a dramatically reduced footprint.
It all adds up to big-system JBL sound in a flexible, compact line
array system.
INNOVATIVE RIGGING
The VTX A8 rigging is identical to the A12, for quick, easy
deployment of integrated systems. Rigging features an au-
to-locking mechanism, which allows the selection of angles
while components are on the ground; once the system is sus-
pended, the mechanism automatically locks cabinet angles in
designated positions. Set angles simply by pulling and placing
a pin—it’s that easy.
ACCESSORIES
Multiple accessory options provide flexibility in the VTX A8’s
mounting, integration and installation capabilities. Highlights
include a Base Plate that mounts the A8 on top of ground-
stacked subwoofers such as the new B18. The truss clamp
and mini frame enable the A8 to be mounted on a truss, mak-
ing it ideal for trade shows or small productions.
3-WAY, 2-CHANNEL DESIGN
The VTX A8 features a 3-way design but utilizes a passive network
to drive both the MF and HF sections with a single amplifier channel.
Reducing system amplifier count translates to simpler configuration,
lighter total weight, less truck space and lower overall costs.

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VTX A8| User Manual
6.2 - VTX B18
The VTX B18 is JBL Professional’s next-generation single 18” subwoofer, designed to complement VTX full-range sound reinforcement
systems. The VTX B18 features JBL’s new 2288H 18” woofer, engineered for improved linearity, increased sensitivity and extra-long
excursion. The 2288H is based on JBL’s Differential Drive, dual voice coil, dual-gap technology, which delivers better heat dissipation,
lower power compression and wider dynamic range than conventional single-coil designs. The B18 incorporates JBL’s patented Slip
Stream™ double-flared exponential low-frequency port design to improve airflow and reduce audible turbulence, even at maximum
excursion. The B18 shares the industrial design of the JBL’s VTX A-Series products and has the same width and suspension hardware
as the VTX A8, allowing the two products to be used together in a variety of flown or ground-stacked configurations. The VTX B18 can
be deployed in omni-directional or cardioid configurations, in arrays of up to 16 enclosures.
TRANSDUCER DESIGN
The VTX B18 features JBL’s first new 18” high-performance woofer
design in a decade, engineered from the ground up to deliver trans-
parent, linear bass response down to 28 Hz. The 18” driver leverag-
es JBL’s patented fourth-generation Differential Drive technology to
deliver maximum sensitivity and power handling in a light, compact
design.
CONTROLLABLE COVERAGE
The VTX B18 can be used in omni-directional or cardioid con-
figurations simply by selecting the appropriate speaker preset
and cabinet orientation. Speaker connectors are available on
both the front and back, streamlining cable management in
either configuration. A switch on the rear input panel allows for
selecting between channel 1 or 2 of the NL4 cable, minimizing
cable requirements.
VTX BUILD QUALITY
The VTX B18 adopts the VTX A-Series’ signature full-face grill
design, which minimizes exposed components and protects
the loudspeaker from extreme conditions. The enclosed grill
helps the system achieve a higher Ingress Protection (IP55)
rating.
VTX A8 COMPATIBILITY
The B18 rigging system is compatible with the VTX A8 rigging sys-
tem, allowing B18 subwoofers to be suspended above an A8 array.
The VTX B18 rigging system allows for omnidirectional or cardioid
configurations in small and large-scale flown or groundstacked ar-
rays. All VTX A8 suspension accessories are compatible and arrays
of up to 16 enclosures can be created.

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VTX A8| User Manual
7 - CONNECTIONS
The JBL VTX A8 is equipped with two Neutrik NL4 SpeakON connectors. Both NL4 connectors are wired in parallel and can be used
as the system input or as a through connection for daisy-chaining multiple cabinets together. The NL4 connectors are installed upside
down so that the NL4 locking pin position can be seen from under the array.
The VTX B18 is equipped with four Neutrik NL4 SpeakON connectors, two at the rear for the cabinet and two at the front grill. All four
NL4 connectors are wired in parallel and can be used interchangeably. The NL4 connectors at the front of the B18 are typically used
when the B18s are setup in a cardioid configuration and when some of the enclosures are pointed backwards. All NL4 connectors are
installed upside down so that the NL4 locking pin position can be seen from under the array.
Designedin Los Angeles, CA
Madein Mexico
A8
Compact Dual 8” Line Array Element
PINOUT
Pin1
Pin2
LF
MHF
IN/OUT IN/OUT
NL4 Connectors : IN/OUT
A channel selection switch is available at the rear of the B18 which allows for selecting between Pin-1 and Pin-2 of the NL4 connector/
cable. The switch is wired after the four NL4 connectors and affects all connections equally. For more information on the B18 refer to
the B18 User Manual.
CAUTION: Always use high-quality insulated speaker cables made by reputable manufactures. Keep cable length as
short as possible with sufficient gauge for the application.
Front NL4 Connectors : IN/OUT
B18
Compact Single 18” Subwoofer
IN/OUT IN/OUT
AB
ChannelSelec tion
SN
Rear NL4 Connectors : IN/OUT
Channel Selection Switch

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VTX A8| User Manual
7.1 - B18 INTERNAL WIRING
7.1 - A8 INTERNAL WIRING
1+
1-
2+
2-
1+
1-
2+
2-
Passive Network
MF / HF
LF
HF
MF
NL4
Pin Selection
Switch
A B
1+
1-
2+
2-
1+
1-
2+
2-
1+
1-
2+
2-
1+
1-
2+
2-
SUB
FRONT NL4 REAR PANEL NL4

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VTX A8| User Manual
8 - SYSTEM AMPLIFICATION & WIRING
Like all other VTX systems, the VTX A8 and B18 cabinets are powered exclusively by Crown I-Tech HD amplifiers, providing optimum
performance and consistency across the world. The Crown I-Tech HD Series amplifiers feature BSS Audio OMNIDRIVEHD™ processing
for each amplifier channel, including the acclaimed LevelMAX™ Limiter Suite and support for linear-phase FIR filters. All VTX A8 and B18
processing is performed using the I-Tech HD’s internal processing, so no other external DSP is required. The Crown amplifiers include a
user-adjustable input section for room correction equalization, array size compensation and circuit adjustments.
Standard JBL presets are available for both the Crown I-Tech 4x3500HD and Crown I-Tech 12000HD. The most up-to-date presets are
available for download from the www.jblpro.com website and are always bundled in the latest version of JBL’s Performance ManagerTM
control software.
8.1 - A8 ON CROWN I-TECH 4X3500HD AND NL4 CABLES
When using Crown Audio I-Tech 4x3500HD amplifiers, up to 6 VTX A8 (3 x per circuit) loudspeakers can be powered per amplifier. Based
on the A8 component resource requirements, this allows for optimum power-to-transducer ratio without compromising the maximum
SPL capabilities of the system. Circuits of 2 cabinets can be used when higher circuiting resolution is necessary. The example below
illustrates how to connect 6 x VTX A8 cabinets to an I-Tech 4x3500HD amplifier using standard 4-contactor NL4 cables.
Amplifier Channels
Channel 1 A8 LF
Channel 2 A8 MF/HF
Channel 3 A8 LF
Channel 4 A8 MF/HF
Crown I-Tech 4x3500HD 6 x VTX A8
NL4 Cables
CH1/CH2 CH3/CH4
OUTPUTS
Amplifier Rear Panel