JBL VT4888, VT4880, VT4889, VT4887, VT4881 User Manual

Array Applications Manual

For models VT4889, VT4888, VT4887, VT4881, VT4880

TABLE OF CONTENTS

PAGE

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

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

STANDARD AMPLIFICATION RACK

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

VT4887 & VT4881

TRANSDUCER COMPLEMENT.………………………………….…….. 5 AMPLIFIER CONFIGURATION OPTIONS

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

VT4888

TRANSDUCER COMPLEMENT………………………………………… 8 AMPLIFIER CONFIGURATION OPTIONS

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

VT4889

TRANSDUCER COMPLEMENT………………………………………… 11 AMPLIFIER CONFIGURATION OPTIONS

VT4880 TRANSDUCER COMPLEMENT & AMPLIFIER CONFIGURATION.. 12

VT4889 ARRAY WIRING ……………….…………………………………….. 13

VERTEC SYSTEMS SUSPENSION HARDWARE

AND ASSEMBLY NOTES………………………………………………… 14

PARTS GUIDE: VERTEC SYSTEMS SUSPENSION HARDWARE……………. 15

VERTEC VT4888, VT4887, VT4881: SYSTEM SUSPENSION FRAMES……… 16

VERTEC: SYSTEM SUSPENSION HINGE BARS………………………………. 17

PICTURE: VT4889 WITH VT4887 HANG UNDER USING VT4800-DA….…... 18

PICTURE: VT4887 CLUSTER SUSPENDED USING VT4887-AF……………… 19

VERTEC SUPPORT TEAM AND WEBLINKS…………………………….……. . 20

Page 2

GENERAL AMPLIFICATION NOTES & REQUIREMENTS

• For the purpose of this discussion: Crown MA 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).

• Equivalent amplifiers can be used as substitutions.

• Users should observe differences in input sensitivity and maximum available power at a

given impedance load.

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

• DSP crossover presets provided by JBL assume that the same amplifier models with

equal voltage gain, are used for each bandpass.

• If different gain settings or amplifiers models are used, users may need to adjust the output gains of the digital controller(s).

VT4889

• 4 VT4889 can be powered with (4) MA-3600, although the MA-5002 is recommended.

 Two boxes are wired in parallel per NL8 circuit.  (HF: CH1 & CH2, MF: CH1 & CH2, LO1: CH1 & CH2, LO2: CH1 & CH2)

• Using MA-5002’s would provide enough power to drive up to 6 VT4889.

 Three boxes are wired in parallel per NL8 circuit.

• MA-2402 or MA-3600 can be used for the HF section to power 2 or 3 boxes.

VT4888

• 4 VT4888 can be powered with (4) MA-3600, although the MA-5002 is recommended.

 Two boxes are wired in parallel per NL8 circuit.  (HF: CH1 & CH2, MF: CH1 & CH2, LO1: CH1 & CH2, LO2: CH1 & CH2)

• Using MA-5002’s would provide enough power to drive up to 6 VT4888.

 Three boxes are wired in parallel.

• MA-2402 or MA-3600 can be used for the HF section to power 2 or 3 boxes.

VT 4887

• 4 VT4887 can be powered with one (1) MA-5002.

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

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

• MA-2402 or MA-3600 or MA-36x12 can be used if 2 boxes are wired in parallel instead.

VT4880

• 2 VT4880 are usually wired to (1) MA-3600 or (1) MA-5002.

 If two boxes are wired in parallel using NL4 cables then

CH1: 2258 left, pin 1+

• Up to 3 boxes could be wired in parallel with loads of 2.7 ohms per amp channel.

VT4881

• 2 VT4881 are usually wired to (1) MA-3600 or (1) MA-5002.

 If two boxes are wired in parallel using NL8 cables then

CH1: 2256G coil 1, pin 1+

• Up to 3 boxes could be wired in parallel with loads of 2.7 ohms per amp channel.

• Make parallel connections at amplifier rack to minimize cable losses.

@ 4 ohms & CH2: 2258 right, pin 2+ @ 4 ohms.

@ 4 ohms & CH2: 2256G coil 2, pin 2+ @ 4 ohms.

Page 3

NOTES ON SUBWOOFER WIRING

• VT4880: Users may choose to wire both 2258 (18”) components in parallel to one (1) channel of a MA-3600 or MA-5002 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 and there will be no amplifier power headroom.

• VT4881: Users may choose to wire both coils one (1) channel drives one VT4881. If two VT4881 are wired in parallel, the load is two ohms.

USERS MUST NOT WIRE THE VOICE COILS ON A 2256G (VT4881) OUT OF POLARITY TO EACH OTHER. NL8: PIN 1 + NL8: PIN 2 +

channel of a MA-3600 or MA-5002 for (4) ohms load. In this case each amplifier

= RED CONNECTOR A & BLACK CONNECTOR A = RED CONNECTOR B & BLACK CONNECTOR B

in a single 2256G component in parallel to

STANDARD AMPLIFICATION RACK

For those users looking to minimize amplifier rack configurations, one rack with 4 MA-5002 and 2 NL8 output circuits can power up to:

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

 OR

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

 OR

• 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.

• VT4889 or VT4888

 DSP outputs: LO, MID, HIGH (stereo)

• VT4887 & VT4881

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

Page 4

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 Crown MA-5002 in stereo mode with input sensitivity of 1.4V for a voltage gain of 37 dB. Amplifier limiter and Offset Integration switches are set to the off

• 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.

position.

VT4887 & VT4881 Transducer Complement:

Nominal

Model

HF

MF

LF

VLF

1

PASSIVELY CROSSED OVER MID/HIGH FREQUENCY SECTION.

2

LF SECTION HAS TWO 8” COMPONENTS WIRED IN PARALLEL.

3

SINGLE COMPONENT WITH TWO VOICE COILS INDEPENDENTLY WIRED.

2407H

2104H

2168J

2256G

Speakon NL8

Terminals

Pins 4±

Pins 3±

Pins 1± & 2±

2

Per box

1

3

Impedance

per

Transducer

x 2

x 4 8Ω 8Ω 50W 200W 450W

x 2

x 1 2 x 8Ω 8Ω + 8Ω 600W 2400W 1200W

8Ω 8Ω

16Ω 8Ω

Nominal

Impedance

per

Passband

AES Power

100 HR

Rating per

Transducer

25W 100W 450W

350W 1400W 1000W

Peak

Power

Rating per

Transducer

Recommended

Power per Passband

Page 5

Amplifier Configurations:

5002

Amplifier

Channel

Ch 1.

MA-5002VZ

Ch2.

Ch 1.

MA-5002VZ

Ch2.

Ch 1.

MA-5002VZ

Ch2.

Speakon NL8

Terminals

Pins 4±

Pins 3± 4 x 2168J

Pins 1± & 2± 1 x 2256G

Pins 1± & 2± 1 X 2256G

Driving

4 x 2407H

& 8 x 2104H

4 x 2407H

& 8 x 2104H

Nominal

Impedance

at Pins

4Ω

* 6 dB of headroom required for extended bandpass.

Amplifier Power

Rating at

Nominal

Impedance

1800W 900W 54V -3

1800W 900W 134V 4

1800W 900W 86V -2*

4 x VT4887 & 2 VT4881 / 3 MA-

Power

Available to

each

Bandpass

Peak

Voltage

Vac

Limiter

Threshold

dBu

Amplifier Configurations: 4 x VT4887 & 2 VT4881 / 3 MA-

3600

Amplifier

Channel

Ch 1.

MA-3600 VZ

Ch2.

Ch 1.

MA-3600 VZ

Ch2.

Ch 1.

MA-3600 VZ

Ch2.

EASY: 1 X MA-3600 = 2 VT4887 1 X MA-3600 = 2 VT4881

Speakon NL8

Terminals

Pins 4±

Pins 3± 4 x 2168J

Pins 1± & 2± 1 x 2256G

Pins 1± & 2± 1 X 2256G

Driving

4 x 2407H

& 8 x 2104H

4 x 2407H

& 8 x 2104H

Nominal

Impedance at

Pins

4Ω

Amplifier Power

Rating at

Nominal

Impedance

1120W 560W 54V -3

1565W 783W 134V 4

1565W 1565W 86V 1

Power Available

to each

Bandpass

Peak

Voltage

Vac

Limiter

Threshold

dBu

Page 6