JBL VTX Series Manuale utente
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VTX Subwoofer Wiring Guide
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Introduction
JBL VTX Series subwoofers come equipped with Neutrik STX-Series speakON type connectors for connecvity to ampli-
ers. Depending on the applicaon and available cables, a number of wiring schemes can be used to achieve the de-
sired exibility while using the least amount of cables.
This document outlines wiring techniques used for powering JBL VTX Series subwoofer products with Crown I-Tech HD
series ampliers.
Internal VTX Subwoofer Wiring
All VTX series subwoofers (with the excepon of the VTX F18S) have the two woofer components independently wired
to the input panel NL connectors. One woofer is connected to Pin 1 (±) and the other to Pin 2 (±). The same pin cong-
uraon is used for NL4 and NL8 connectors, giving the user the choice to use either type of cable. For the case of NL8
connectors, Pins 3 and Pins 4 are wired as pass-through connecons (straight from one connector to the other) and
are not used to drive the subwoofer components.
Pin 1±
Pin 2±
Pin 1±
Pin 2±
NL4 Wiring for VTX Subwoofers NL8 Wiring for VTX Subwoofers
Pin 1± Pin 2±
Pin 3± = THRU | Pin 4± = THRU
VTX Subwoofer VTX Subwoofer input panel
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Crown Audio I-Tech 12000HD Wiring:
Crown Audio I-Tech 4x3500HD Wiring:
NL4 Wiring
Pin 1± Channel 1
Pin 2± Channel 2
NL4 Wiring
Pin 1± Channel 2
Pin 2± Not Connected
NL4 Wiring CH1/2
Pin 1 ± Channel 1
Pin 2 ± Channel 2
NL4 Wiring CH3/4
Pin 1 ± Channel 3
Pin 2 ± Channel 4
NL8 Wiring CH1-4
Pin 1 ± Channel 1
Pin 2 ± Channel 2
Pin 3 ± Channel 3
Pin 4 ± Channel 4
Crown Audio 2-channel I-Tech HD ampliers come with both channels 1 and 2 wired to the upper (CH1) NL4 connector.
This wiring method is typically used when powering 2-way bi-amplied loudspeakers and has Channel 1 outputs wired
to Pins 1 ±, and Channel 2 outputs wired to Pins 2 ±. The lower (CH2) NL4 connector is dedicated to Channel 2 and uses
Pins 1 ± (note: Pins 2 ± are not connected). The wiring conguraon for the output connectors is shown below:
The 4-channel Crown Audio I-Tech 4x3500HD includes 2 x NL4 connectors and has Channels 1 & 2 wired to the le NL4
and Channels 3 & 4 wired to the right NL4. An NL8 output connector is also available that contains all 4 amplier chan-
nels on Pins 1 ± through 4 ± respecvely. Output connector wiring conguraons are shown below:
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I-Tech 12000HD Standard Wiring (Discrete Mode):
Standard 4-conductor NL4 cables can be used to connect VTX subwoofers to Crown I-Tech HD ampliers. Using stand-
ard cables, each component within a VTX subwoofer enclosure is connected to an independent amplier channel as
shown in the drawing below. This wiring method is referred to as discrete wiring since each transducer within the en-
closure is discretely wired to an individual amplier channel.
Crown I-Tech 12000HD
NL4 Cable
Channel 1 Channel 2
Pins-1 ±Pins-2 ±
For this conguraon only the Channel 1 (Top) NL-4 connector should be used since it contains both Channel 1 and
Channel 2 of the iTech amplier. If the Channel 2 connector is used, one of the transducers will be le disconnected as
shown in the example below.
X
Not Connected
Crown I-Tech 12000HD
NL4 Cable
Channel 2
Pins-2 ±
Similarly, using the two NL amplier connectors for connecng mulple VTX subwoofer encloses should be avoided.
This wiring will only power 3 of the 4 subwoofer components, creang an 8-ohm load for Channel 1 and a 4-ohm load
for channel 2.
Incorrect
Channel 1 Channel 2
X
Not Connected
Channel 2
Pins-1 ±
8-ohm
Pins-2 ±
4-ohm
Pins-2 ±
4-ohm
NL4 Cable
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I-Tech 12000HD Standard Wiring Examples:
Standard NL4 jumper cables can be used to connect mulple subwoofer enclosures together in a daisy chain wiring
scheme. When connecng VTX subwoofers in this manner, each amplier channel powers half of the subwoofer group.
Below are some examples using VTX Subwoofers and discrete wiring:
Example: 6x VTX S25 powered by iTech 12000HD ampliers
Example: 12x VTX S28 powered by iTech 12000HD ampliers
CH1
CH2
CH1
CH2
CH1
CH2
Crown I-Tech 12000HD
CH1
CH2
CH1
CH2
CH1
CH2
CH1
CH2
CH1
CH2
CH1
CH2
CH1
CH2
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The discrete wiring mode reduces the number of cables required to wire a subwoofer system to a minimum, however
this is at the expense of exibility. Since mulple enclosures are powered and processed by the same pair of amplier
channels, DSP parameters such as presets or delay can only be applied to groups of subwoofers, not individual sub-
woofers. For opmum exibility, one subwoofer per amplier channel (parallel wiring mode) is recommended since it
is more convenient to implement cardioid subwoofer conguraons and Electronic Delay Steering (EDS). Parallel mode
operaon and adapter cable accessories are discussed in the following secons.
I-Tech 4x3500HD Standard Wiring (Discrete Mode):
The same wiring conguraon can be achieved with the Crown 4x3500HD amplier by using 2 x NL4 cables and 2 x NL4
jumpers as shown below:
NL4 Wiring CH1/2
Pin 1 ± Channel 1
Pin 2 ± Channel 2
NL4 Wiring CH3/4
Pin 1 ± Channel 3
Pin 2 ± Channel 4
CH1
CH2
CH3
CH4
Crown I-Tech 4x3500HD
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Parallel Wiring Mode:
Powering subwoofers in parallel mode with one subwoofer per amplier channel provides opmum exibility for im-
plemenng cardioid subwoofer conguraons and Electronic Delay Steering (EDS) as well as an opmum 4-ohm load
for power amplier channels. This wiring method allows for greater design and control exibility since each VTX enclo-
sure is connected to its own amplier and DSP channel. Parallel wiring also makes tesng easier since each subwoofer
can be tested independently.
In this conguraon a breakout cable or a rack I/O panel is necessary to wire the two subwoofer transducers to one
amplier channel. These adapter cables are easy to construct out of stock connectors and cables. The pin conguraon
is provided later in this document.
JBL Professional has partnered with cable manufacturer Link to oer these adapter cables as nished goods that can
be ordered internaonally directly from Link. Below are the part numbers for the products and to purchase, please
contact Link at: sales@linkusa-inc.com
LK VTX-NL-424
For use with 2 Channel Itech HD ampliers
NL4-1
NL4-2
LK VTX-NL-844
For use with 4 Channel Itech HD amplier
NL4-1
NL4-2
NL4-3
NL4-4
Female NL4 Female NL8
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I-Tech 12000HD Parallel Mode Example:
Using the LK VTX-NL-424 breakout cable, two subwoofer encloses can be connected to a single 2 channel iTech HD
amplier. The breakout cable allows each subwoofer to be connected to an independent amplier channel as illustrat-
ed in the example below. The breakout cable should always be connected to the CH1 (TOP) NL4 connector which con-
tains both Channel 1 and Channel 2.
NL4 Cable LK VTX-NL-424
I-Tech 4x3500HD Parallel Mode Example:
To implement parallel mode wiring on IT-4x3500HD ampliers, a pair of LK VTX-NL-424 adapters can be used in con-
juncon with 2 x NL4 cables that are directly connected to the amplier’s NL4 outputs. Alternavely, a single NL8 cable
can be used in conjuncon with the recommended 3rd party accessory shown below (Link USA LK VTX-NL-844) . In this
case the cable is connected to the NL-8 connector which contains all 4 channels. This makes for an easy and convenient
wiring scheme since a single NL8 cable can be used to independently power 4x VTX subwoofer enclosures and this sig-
nicantly reduces the number of cables needed.
NL8 Cable LK VTX-NL-844
CH1
CH2
CH1
CH2
CH3
CH4
Crown I-Tech 12000HD
Crown I-Tech 4x3500HD
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Breakout Cable Examples:
The example below shows an array of 6x VTX G28 wired using the LK VTX-NL-424 breakout cable. In this conguraon
each VTX subwoofer is driven by an independent amplier channel allowing for exible cardioid subwoofer circuing
and a unique delay value (EDS) for each enclosure.
When construcng large horizontal subwoofer arrays, the overall size of an array can have a negave impact on the
subwoofer coverage. The longer the array, the narrower the coverage. Electronic Delay Steering (EDS) is a technique
used to alter the coverage angle of a given subwoofer array by applying a specic pre-calculated delay value to each
subwoofer enclosure. The goal of EDS is to electronically alter the shape of a subwoofer array and widen the coverage
paern by creang a virtual arc. The radius of the arc controls the radiang paern of the array and each delay value is
carefully calculated to align all subwoofers to the virtual arc. Hybrid cardioid EDS subwoofer arrays provide even hori-
zontal coverage with 15—25 dB broadband SPL rejecon behind the array. Below is an example of a 12x G28 cardioid
subwoofer array and the appropriate delay values for a 90-degree coverage paern.
0.29ms 0.77ms 1.45ms 2.29ms 3.25ms0.00ms0.00ms0.29ms0.77ms1.45ms2.29ms3.25ms
NL4 Cable
LK VTX-NL-424
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Breakout Cable Examples:
The example below shows an array of 3x VTX S25 and a Vertec 4886 used as a front ll enclosure. The array is wired
using the LK VTX-NL-844 breakout cable to a single Crown iTech 4x3500HD amplier. In this conguraon the breakout
cable provides independent DSP for each speaker allowing for a cardioid conguraon for the subwoofers and a sepa-
rate preset for the VT4886 front ll. Mulples of this conguraon can be used for larger system conguraons.
Another interesng use case for the LK VTX-NL-844 breakout cable (unrelated to subwoofers) is when used with the
Vertec VT4886 line array system. The VT4886 is a 12-ohm passive line array element that can be driven and processed
by Crown iTech HD ampliers. Up to 4x VT4886 cabinets can be used on each amplier channel and up to 16x cabinets
per Crown iTech 4x3500HD amplier. An enre array of 16x elements can be powered using a single NL-8 cable and the
LK VTX-NL-844 breakout as illustrated in the example below.
NL8 Cable
LK VTX-NL-844
Crown I-Tech 4x3500HD
Crown I-Tech 4x3500HD
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