JBL VTX Series Manuel utilisateur

VTX Subwoofer Wiring Guide

Introduction

JBL VTX Series subwoofers come equipped with Neutrik STX-Series speakON type connectors for connecvity to ampli-

ers. Depending on the applicaon 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 ampliers.

Internal VTX Subwoofer Wiring

All VTX series subwoofers (with the excepon 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 cong-

uraon 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 connecons (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

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 ampliers 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-amplied 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 conguraon 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 amplier chan-

nels on Pins 1 ± through 4 ± respecvely. Output connector wiring conguraons are shown below:

I-Tech 12000HD Standard Wiring (Discrete Mode):

Standard 4-conductor NL4 cables can be used to connect VTX subwoofers to Crown I-Tech HD ampliers. Using stand-

ard cables, each component within a VTX subwoofer enclosure is connected to an independent amplier 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 amplier channel.

Crown I-Tech 12000HD

NL4 Cable

Channel 1 Channel 2

Pins-1 ±Pins-2 ±

For this conguraon only the Channel 1 (Top) NL-4 connector should be used since it contains both Channel 1 and

Channel 2 of the iTech amplier. If the Channel 2 connector is used, one of the transducers will be le disconnected as

shown in the example below.

Not Connected

Crown I-Tech 12000HD

NL4 Cable

Channel 2

Pins-2 ±

Similarly, using the two NL amplier connectors for connecng mulple VTX subwoofer encloses should be avoided.

This wiring will only power 3 of the 4 subwoofer components, creang an 8-ohm load for Channel 1 and a 4-ohm load

for channel 2.

Incorrect

Channel 1 Channel 2

Not Connected

Channel 2

Pins-1 ±

8-ohm

Pins-2 ±

4-ohm

Pins-2 ±

4-ohm

NL4 Cable

I-Tech 12000HD Standard Wiring Examples:

Standard NL4 jumper cables can be used to connect mulple subwoofer enclosures together in a daisy chain wiring

scheme. When connecng VTX subwoofers in this manner, each amplier 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 ampliers

Example: 12x VTX S28 powered by iTech 12000HD ampliers

CH1

CH2

CH1

CH2

CH1

CH2

Crown I-Tech 12000HD

CH1

CH2

CH1

CH2

CH1

CH2

CH1

CH2

CH1

CH2

CH1

CH2

CH1

CH2

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 mulple enclosures are powered and processed by the same pair of amplier

channels, DSP parameters such as presets or delay can only be applied to groups of subwoofers, not individual sub-

woofers. For opmum exibility, one subwoofer per amplier channel (parallel wiring mode) is recommended since it

is more convenient to implement cardioid subwoofer conguraons and Electronic Delay Steering (EDS). Parallel mode

operaon and adapter cable accessories are discussed in the following secons.

I-Tech 4x3500HD Standard Wiring (Discrete Mode):

The same wiring conguraon can be achieved with the Crown 4x3500HD amplier 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

Parallel Wiring Mode:

Powering subwoofers in parallel mode with one subwoofer per amplier channel provides opmum exibility for im-

plemenng cardioid subwoofer conguraons and Electronic Delay Steering (EDS) as well as an opmum 4-ohm load

for power amplier channels. This wiring method allows for greater design and control exibility since each VTX enclo-

sure is connected to its own amplier and DSP channel. Parallel wiring also makes tesng easier since each subwoofer

can be tested independently.

In this conguraon a breakout cable or a rack I/O panel is necessary to wire the two subwoofer transducers to one

amplier channel. These adapter cables are easy to construct out of stock connectors and cables. The pin conguraon

is provided later in this document.

JBL Professional has partnered with cable manufacturer Link to oer these adapter cables as nished goods that can

be ordered internaonally 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 ampliers

NL4-1

NL4-2

LK VTX-NL-844

For use with 4 Channel Itech HD amplier

NL4-1

NL4-2

NL4-3

NL4-4

Female NL4 Female NL8

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

amplier. The breakout cable allows each subwoofer to be connected to an independent amplier 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 ampliers, a pair of LK VTX-NL-424 adapters can be used in con-

juncon with 2 x NL4 cables that are directly connected to the amplier’s NL4 outputs. Alternavely, a single NL8 cable

can be used in conjuncon 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-

nicantly 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

Breakout Cable Examples:

The example below shows an array of 6x VTX G28 wired using the LK VTX-NL-424 breakout cable. In this conguraon

each VTX subwoofer is driven by an independent amplier channel allowing for exible cardioid subwoofer circuing

and a unique delay value (EDS) for each enclosure.

When construcng large horizontal subwoofer arrays, the overall size of an array can have a negave 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 specic 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

paern by creang a virtual arc. The radius of the arc controls the radiang paern 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 rejecon behind the array. Below is an example of a 12x G28 cardioid

subwoofer array and the appropriate delay values for a 90-degree coverage paern.

0.29ms 0.77ms 1.45ms 2.29ms 3.25ms0.00ms0.00ms0.29ms0.77ms1.45ms2.29ms3.25ms

NL4 Cable

LK VTX-NL-424

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 amplier. In this conguraon the breakout

cable provides independent DSP for each speaker allowing for a cardioid conguraon for the subwoofers and a sepa-

rate preset for the VT4886 front ll. Mulples of this conguraon can be used for larger system conguraons.

Another interesng 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 ampliers. Up to 4x VT4886 cabinets can be used on each amplier channel and up to 16x cabinets

per Crown iTech 4x3500HD amplier. An enre 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

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