JBL VerTec VT4889 Merkblatt

System Configuration Manual

Using crown I-Tech series

For models VT4889, VT4888, VT4887, VT4881, VT4880

Page 2

TABLE OF CONTENTS

PAGE

GENERAL AMPLIFICATION NOTES & REQUIREMENTS…………………. 3

SUBWOOFER WIRING NOTES………………………………………………… 4

STANDARD AMPLIFICATION RACK

NOTES REGARDING LIMITER SETTINGS……………………………..…….. 5

VT4887 & VT4881

TRANSDUCER COMPLEMENT.………………………………….…….. 6

AMPLIFIER CONFIGURATION OPTIONS

VT4887 & VT4881 ARRAY WIRING……………………………………………. 7

VT4888

TRANSDUCER COMPLEMENT………………………………………… 8

AMPLIFIER CONFIGURATION OPTIONS

VT4888 ARRAY WIRING………………………………………………………... 10

VT4889

TRANSDUCER COMPLEMENT………………………………………… 12

AMPLIFIER CONFIGURATION OPTIONS

VT4889 ARRAY WIRING……………… ……………………………………….. 14

VT4880 TRANSDUCER COMPLEMENT & AMPLIFIER CONFIGURATION.. 17

VT4880 ARRAY WIRING……………… ……………………………………….. 18

VERTEC SUPPORT TEAM AND WEBLINKS…………………………….…….. 19

Page 3

GENERAL AMPLIFICATION NOTES & REQUIREMENTS

oFor the purpose of this discussion: Crown I_TECH series amplifiers are used below. HF

indicates High Frequency drivers, MF indicates Mid Frequency drivers, LF indicates Low

Frequency drivers and VLF stands for Very Low Frequency drivers (subwoofers).

oEquivalent amplifiers can be used as substitutions.

oUsers should observe differences in input sensitivity and maximum available power at a given

impedance load.

oUsers may choose to use the same size amplifier to power all components / passbands.

oDSP crossover presets provided by JBL assume that the same amplifier models with equal

voltage gain, are used for each bandpass.

oIf different gain settings or amplifiers models are used, users may need to adjust the output

gains of the digital controller(s).

VT4489

o 4 VT4889 can be powered with (4) I-T4000.

Two boxes are wired in parallel per NL8 circuit.

(HF: CH1 & CH2, MF: CH1 & CH2, LO1: CH1 & CH2, LO2: CH1 & CH2)

o Using (4) I-T6000 would provide enough power to drive up to 6 VT4889.

Three boxes are wired in parallel per NL8 circuit.

o I-T4000 can be used for the HF section to power 2 or 3 boxes.

VT4888

o 4 VT4888 can be powered with 4 I-T4000.

Two boxes are wired in parallel per NL8 circuit.

(HF: CH1 & CH2, MF: CH1 & CH2, LO1: CH1 & CH2, LO2: CH1 & CH2)

o Using 4 I-T6000 would provide enough power to drive up to 6 VT4888.

Three boxes are wired in parallel.

o I-T4000 can be used for the HF or MF section to power 2 or 3 boxes.

VT 4887

o 4 VT4887 can be powered with (1) I-T4000.

If four boxes are wired in parallel per NL8 circuit then

CH1: LF @ 2 ohms & CH2: MH/HF @ 2 ohms.

VT4880

o 2 VT4880 can be powered with (1) I-T4000.

If two boxes are wired in parallel using NL4 cables then each amp channel powers (4) 2258

for a 4 ohms load.

o 3 VT4880 can be powered with (1) I-T6000.

If three boxes are wired in parallel using NL4 cables then each amp channel powers (3)

2258 for a 2.7 ohms load.

o 4 VT4880 can be powered with (1) I-T8000.

If four boxes are wired in parallel using NL4 cables then each amp channel powers (4) 2258

for a 2.0 ohms load.

Separate NL4 cable runs are recommended with parallel wiring at the amp.

VT4881

o 4 VT4881 can be powered with (1) I-T4000.

If four boxes are wired in parallel using NL4 cables then each amp channel powers (4)

distinct coils of dual-coil 2256Gs for a 2.0 ohms load. Each 2256G has (2) coils.

Separate NL4 cable runs are recommended with parallel wiring at the amp.

Page 4

NOTES ON SUBWOOFER WIRING

oVT4880: users may choose to wire both 2258 (18”) components in parallel to one (1) channel of

a an I-T amp for (4) ohms load. In this case each amplifier channel drives one VT4880. If two

VT4880 are wired in parallel, the load is two ohms. Three 4880s can not wired in parallel in this

situation.

oVT4881: users may choose to wire both coils in a single 2256G component in parallel to one (1)

channel of an I-T amp for (4) ohms load. In this case each amplifier channel drives one

VT4881. If two VT4881 are wired in parallel, the load is two ohms. Three 4881s can not wired

in parallel in this situation.

USERS MUST NOT WIRE THE VOICE COILS ON A 2256G (VT4881) OUT OF POLARITY TO

EACH OTHER.

NL8: PIN 1 + = RED CONNECTOR A & BLACK CONNECTOR A

NL8: PIN 2 + = RED CONNECTOR B & BLACK CONNECTOR B

STANDARD AMPLIFICATION RACK

For those users looking to minimize amplifier rack configurations, one amplifier rack with

(1) I-T4000 and (3) I-T6000 and 2 NL8 output circuits can power up to:

o 4 to 6 VT4889 (2 or 3 boxes per circuits AMPS: HF, MF, LF1, LF2)

OR

o 4 to 6 VT4888 (2 or 3 boxes per circuits AMPS: HF, MF, LF1, LF2)

OR

o 8 VT4887 & 4 VT4881

(4 VT4887 & 2 VT4881 per circuit AMPS: MF/HF, LF, VLF1, VLF2)

This rack would use the same input signal path from the digital controller of choice. Users would only

need to recall the appropriate DSP file on the unit.

o VT4889 or VT4888

DSP outputs: LO, MID, HIGH (stereo)

o VT4887 & VT4881

DSP outputs: SUB, LO, MID/HIGH (stereo)

Page 5

NOTES REGARDING LIMITER SETTINGS

•The recommended limiter threshold settings provide 3 dB of headroom before the

component or bandpass peak voltage is reached.

•The component or bandpass peak voltage is 6 dB above the voltage used at continuous

maximum power.

•These settings assume the use of a I-T amplifier in stereo mode with input sensitivity of

1.3V for a voltage gain of 36 dB.

•If a different amplifier is used or if the input sensitivity is changed, the limiter threshold

must be re-calculated.

•Not all DSP controllers behave the same way. Please study your unit accordingly.

•Users must take into consideration that the digital controller gain outputs are not all “0”

dB, i.e. for VT4889/4880, the VLF is at +6 dB, the LF is at 0 dB, the MF is at -2.5 dB and

the HF is at –4 dB. Hence, the actual headroom before limiter threshold is effectively

greater than it may seem from the above charts.

•Users should carefully test these settings, and lower or raise the thresholds for a given

type of program material as required.

Page 6

VT4887 & VT4881 Transducer Complement:

Model Speakon NL8

Terminals Per box

Nominal

Impedance

per

transducer

Nominal

Impedance

per

Passband

AES Power

100 HR

Rating per

Transducer

Peak Power

Rating per

Transducer

Recommended

Power

per Passband

HF 2407H Pins 4± 1x 2 8Ω 8Ω 25W 100W 450W

MF 2104H Pins 4± 1x 4 8Ω8Ω50W 200W 450W

LF 2168J Pins 3± 2x 2 16Ω 8Ω 350W 1400W 1000W

F 2256G Pins 1± & 2± 3x 1 2 x 8Ω8Ω+ 8Ω600W 2400W 1200W

1PASSIVELY CROSSED OVER MID/HIGH FREQUENCY SECTION

2LF SECTION HAS TWO 8” COMPONENTS WIRED IN PARALLEL.

3SINGLE COMPONENT WITH TWO VOICE COILS INDEPENDENTLY WIRED

Amplifier Configurations:

Four VT4887 & Two VT4881 / Two I-T6000

Amplifier Amplifier

Channel

Speakon

NL8

Terminals

Driving

Nominal

Impedance

at Pins

Amplifier

Power

Rating at

Nominal

Impedance

Power

Available

to Each

Bandpass

Peak

Voltage

VAC

Limiter

Threshold

dBu

Ch 1 Pins 4+/-

8 x

2407H

& 16 x

2104H

2ohms 2500W 625W 54V -3

I-T6000

Ch 2 Pins 3+/- 8 x

2168J 2 ohms 2500W 625W 134V 2

Ch 1 Pins 2+/- 2 x

2256G 4ohms 3000W 1500W 86V 0*

I-T6000

Ch 2 Pins 1+/- 2 x

2256G 4ohms 3000W 1500W 86V 0*

Page 7

IMPORTANT NOTES;

All wiring configurations shown above use 8-conductor speaker cables terminated with Neutrik NL8 "Speakons".

Ensure that each conductor in the cable is a minimum of #13 AW (3-4mm).

JBL VT4887:

The MF & HF section of a VT4887 has an internal passive crossover network. =8ΩPins 4±

This network connects two 2407H HF drivers (8Ω) wired in series

and four 2104H MF (8Ω) wired in Series / Parallel.

The LF section of a VT4887 has two 2168J drivers (16Ω) wired in Parallel. =8ΩPins 3±

JBL VT4881:

The single 15" 2256G VLF device has two 8Ωcoils wired independently. =8Ω/8ΩPins 1±, 2±

2 I-T6000 Power Amplifiers

JBL VerTec VT4887 with VT4881

Power Amplifier configurations - 4 +2 Box Array

Page 8

VT4888 Transducer Complement:

Model

Speakon

NL8

Terminals

Per

box

Nominal

Impedance

per

transducer

Nominal

Impedance

per

Passband

AES Power

100 HR

Rating per

Transducer

Peak Power

Rating per

Transducer

Recommended

Power per

Passband

HF 2431H Pins 4± x 2 8Ω 16Ω75W 300W 300W

MF 2106H Pins 3± x 4 8Ω8Ω100W 400W 800W

LF 2262H Pins 1± & 2± x 2 8Ω8Ω+ 8Ω700W 2800W 2500W

Amplifier Configurations:

Four VT4888 / Two I-T4000s, One I-T8000

Amplifier Amplifier

Channel

Speakon

NL8

Terminals

Driving

Nominal

Impedance

at Pins

Amplifier

Power

Rating at

Nominal

Impedance

Power

Available

to Each

Bandpass

Peak

Voltage

VAC

Limiter

Threshold

dBu

Ch 1 Pins 4+/- 4 x

2431H 8 ohms 1250W 312W 56V -3

I-T4000

Ch 2 Pins 4+/- 4 x

2431H 8 ohms 1250W 312W 56V -3

Ch 1 Pins 3+/- 8 x

2106H 4 ohms 2000W 250W 112V 3

I-T4000

Ch 2 Pins 3+/- 8 x

2106H 4 ohms 2000W 250W 112V 3

Ch 1 Pins 1+/-

& 2+/-

4 x

2262H 2 ohms 3300W 875W 130V 2.5

IT-8000

Ch 2 Pins 1+/-

& 2+/-

4 x

2262H 2 ohms 3300W 875W 130V 2.5

Page 9

Amplifier Configurations:

Six VT4888 / Two I-T4000, Two I-T8000

Amplifier Amplifier

Channel

Speakon

NL8

Terminals

Driving

Nominal

Impedance

at Pins

Amplifier

Power

Rating at

Nominal

Impedance

Power

Available

to Each

Bandpass

Peak

Voltage

VAC

Limiter

Threshold

dBu

Ch 1 Pins 4+/- 6 x

2431H 5.7 ohms 1700W 283W 56V -3

I-T4000

Ch 2 Pins 4+/- 6 x

2431H 5.7 ohms 1700W 283W 56V -3

Ch 1 Pins 3+/- 12 x

2106H 2.7 ohms 1900W 158W 112V 3

I-T4000

Ch 2 Pins 3+/- 12 x

2106H 2.7 ohms 1900W 158W 112V 3

Ch 1 Pins 2+/- 3 x

2262H 2.7 ohms 3750W 1250W 130V 2.5

I-T8000

Ch 2 Pins 2+/- 3 x

2262H 2.7 ohms 3750W 1250W 130V 2.5

Ch 1 Pins 1+/- 3 x

2262H 2.7 ohms 3750W 1250W 130V 2.5

I-T8000

Ch 2 Pins 1+/- 3 x

2262H 2.7 ohms 3750W 1250W 130V 2.5

Page 10

IMPORTANT NOTES

All wiring configurations shown above use 8-conductor speaker cables terminated with Neutrik NL8 "Speakons".

Ensure that each conductor in the cable is a minimum of #13 AWGuage (3-4mm).

JBL VT4888:

The HF section of a VT4888 has two 2431H drivers (8Ω) wired in Series. =16ΩPins 4±

The MF section of a VT4888 has four 2106H drivers (8Ω) wired in Series / Parallel =8ΩPins 3±

The LF section of a VT4888 has two 2262H drivers (8Ω) wired Independently =8Ω/ 8ΩPins 2± / 1±

3 x Power Amplifiers

(2ΩLoad on LF Passband)

4 x Power Amplifiers

(recommended)

JBL VerTec VT4888 Line Array

Power Amplifier configurations - 4 Box Array

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