JBL VerTec VT4889 Instruction sheet

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
VL
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
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
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
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)
OR
JBL VerTec VT4888 Line Array
Power Amplifier configurations - 4 Box Array

Page 11
JBL VerTec VT4888 Line Array
Power Amplifier configurations - 6 Box Array
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 (8W) wired in Series. =16W Pins 4±
The MF section of a VT4888 has four 2106H drivers (8W) wired in Series / Parallel =8W Pins 3±
The LF section of a VT4888 has two 2262H drivers (8W) wired Independently =8W / 8W Pins 2± / 1±

Page 12
VT4889 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 2435H Pins 4± x 3 5.3Ω16Ω75W 300W 300W
MF 2250H Pins 3± x 4 8Ω8Ω300W 1200W 1200W
LF 2255H Pins 1± & 2± x 2 8Ω8Ω+ 8Ω600W 2400W 800W + 800W
Amplifier Configurations:
Four VT4889 / One I-T4000, One I-T6000, 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
Bandpass
Peak
Voltage
VAC
Limiter
Threshold
dBu
Ch 1 Pins 4+/- 6 x
2435H 8 ohms 1250W 208W 100V 2.5
I-T4000
Ch 2 Pins 4+/- 6 x
2435H 8 ohms 1250W 208W 100V 2.5
Ch 1 Pins 3+/- 8 x
2250H 4 ohms 3000W 375W 150V 4.5
I-T6000
Ch 2 Pins 3+/- 8 x
2250H 4 ohms 3000W 375W 150V 4.5
Ch 1 Pins 1+/-
& 2+/-
4 x
2255H 2 ohms 3500W 875W 120V 2
I-T8000
Ch 2 Pins 1+/-
& 2+/-
4 x
2255H 2 ohms 3500W 875W 120V 2
Four VT4889 / One I-T4000, Three I-T6000
Amplifier Amplifier
Channel
Speakon
NL8
Terminals
Driving
Nominal
Impedance
at Pins
Amplifier
Power
Rating at
Nominal
Impedance
Power
Available
to Each
Bandpass
Bandpass
Peak
Voltage
VAC
Limiter
Threshold
dBu
Ch 1 Pins 4+/- 6 x
2435H 8 ohms 1250W 208W 100V 2.5
I-T4000
Ch 2 Pins 4+/- 6 x
2435H 8 ohms 1250W 208W 100V 2.5
Ch 1 Pins 3+/- 8 x
2250H 4 ohms 3000W 375W 150V 4.5
I-T6000
Ch 2 Pins 3+/- 8 x
2250H 4 ohms 3000W 375W 150V 4.5
Ch 1 Pins 2+/- 2 x
2255H 4 ohms 3000W 1500W 120V 3.5
I-T6000
Ch 2 Pins 2+/- 2 x
2255H 4 ohms 3000W 1500W 120V 3.5
Ch 1 Pins 1+/- 2 x
2255H 4 ohms 3000W 1500W 120V 3.5
I-T6000
Ch 2 Pins 1+/- 2 x
2255H 4 ohms 3000W 1500W 120V 3.5

Page 13
Six VT4889 / One I-T4000, Three I-T8000
Amplifier Amplifier
Channel
Speakon
NL8
Terminals
Driving
Nominal
Impedance
at Pins
Amplifier
Power
Rating at
Nominal
Impedance
Power
Available
to Each
Bandpass
Bandpass
Peak
Voltage
VAC
Limiter
Threshold
dBu
Ch 1 Pins 4+/- 9 x
2435H 5.7 ohms 1700W 200W 100V 2
I-T4000
Ch 2 Pins 4+/- 9 x
2435H 5.7 ohms 1700W 200W 100V 2
Ch 1 Pins 3+/- 12 x
2250H 2.7 ohms 3750W 312W 150V 3.5
I-T8000
Ch 2 Pins 3+/- 12 x
2250H 2.7 ohms 3750W 312W 150V 3.5
Ch 1 Pins 2+/- 3 x
2255H 2.7 ohms 3750W 1250W 120V 2
I-T8000
Ch 2 Pins 2+/- 3 x
2255H 2.7 ohms 3750W 1250W 120V 2
Ch 1 Pins 1+/- 3 x
2255H 2.7 ohms 3750W 1250W 120V 2
I-T8000
Ch 2 Pins 1+/- 3 x
2255H 2.7 ohms 3750W 1250W 120V 2
Eight VT4889 / One I-T6000, Three I-T8000
Amplifier Amplifier
Channel
Speakon
NL8
Terminals
Driving
Nominal
Impedance
at Pins
Amplifier
Power
Rating at
Nominal
Impedance
Power
Available
to Each
Bandpass
Bandpass
Peak
Voltage
VAC
Limiter
Threshold
dBu
Ch 1 Pins 4+/- 12 x
2435H 4 ohms 3000W 250W 100V 2
I-T6000
Ch 2 Pins 4+/- 12 x
2435H 4 ohms 3000W 250W 100V 2
Ch 1 Pins 3+/- 16 x
2250H 2 ohms 3500W 218W 150V 2
I-T8000
Ch 2 Pins 3+/- 16 x
2250H 2 ohms 3500W 218W 150V 2
Ch 1 Pins 2+/- 4 x
2255H 2 ohms 3500W 875W 120V 2
I-T8000
Ch 2 Pins 2+/- 4 x
2255H 2 ohms 3500W 875W 120V 2
Ch 1 Pins 1+/- 4 x
2255H 2 ohms 3500W 875W 120V 2
I-T8000
Ch 2 Pins 1+/- 4 x
2255H 2 ohms 3500W 875W 120V 2

Page 14
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 (3-4 mm).
JBL VT4889:
The HF section of a VT4889 has three 2435H drivers (5.3Ω) wired in Series. =16ΩPins 4±
The MF section of a VT4889 has four 2250H drivers (8Ω) wired in Series / Parallel =8ΩPins 3±
The LF section of a VT4889 has two 2255H drivers (8Ω) wired Independently =8Ω/ 8ΩPins 2± / 1±
3 x Power Amplifiers
(2ΩLoad on LF Passband)
4 x Power Amplifiers
(recommended)
OR
JBL VerTec VT4889 Line Array
Power Amplifier configurations - 4 Box Array

Page 15
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 (3-4 mm).
JBL VT4889:
The HF section of a VT4889 has three 2435H drivers (5.3Ω) wired in Series. =16ΩPins 4±
The MF section of a VT4889 has four 2250H drivers (8Ω) wired in Series / Parallel =8ΩPins 3±
The LF section of a VT4889 has two 2255H drivers (8Ω) wired Independently =8Ω/ 8ΩPins 2± / 1±
4 x Power Amplifiers
(recommended)
JBL VerTec VT4889 Line Array
Power Amplifier configurations - 6 Box Array

Page 16
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 #11 AWGuage (3-4 mm). Users might also consider using
TWO NL8 cables for each 4 boxes which are wired in parallel at the rack for a total of 4 cables running to the cluster.
JBL VT4889:
The HF section of a VT4889 has three 2435H drivers (5.3Ω) wired in Series. =16ΩPins 4±
The MF section of a VT4889 has four 2250H drivers (8Ω) wired in Series / Parallel =8ΩPins 3±
The LF section of a VT4889 has two 2255H drivers (8Ω) wired Independently =8Ω/ 8ΩPins 2± / 1±
4 x Power Amplifiers
JBL VerTec VT4889 Line Array
Power Amplifier configurations - 8 Box Array

Page 17
VT4880 Transducer Complement:
Model Speakon NL4
Terminals
Per
box
Nominal
Impedance
per
transducer
Nominal
Impedanc
e per
Passband
AES Power
100 HR
Rating per
Transducer
Peak Power
Rating per
Transducer
Recommende
d Power per
Passband
VLF 2 x 2258H Pins 1± & 2± x 2 8Ω8Ω+ 8Ω800w 3200W 1600W
Amplifier Configurations:
Two VT4880 / One I-T4000
Amplifier Amplifier
Channel
Speakon
NL4
Terminals
Driving
Nominal
Impedance
at Pins
Amplifier
Power
Rating at
Nominal
Impedance
Power
Available
to Each
Bandpass
Bandpass
Peak
Voltage
VAC
Limiter
Threshold
dBu
Ch 1 Pins 1+/-
& 2+/-
2 x
2258H 4 ohms 2000W 1000W 120V 4
I-T4000
Ch 2 Pins 1+/-
& 2+/-
2 x
2258H 4 ohms 2000W 1000W 120V 4
Four VT4880 / One I-T8000
Amplifier Amplifier
Channel
Speakon
NL4
Terminals
Driving
Nominal
Impedance
at Pins
Amplifier
Power
Rating at
Nominal
Impedance
Power
Available
to Each
Bandpass
Bandpass
Peak
Voltage
VAC
Limiter
Threshold
dBu
Ch 1 Pins 1+/-
& 2+/-
4 x
2258H 2 ohms 3500W 875W 120V 3
I-T8000
Ch 2 Pins 1+/-
& 2+/-
4 x
2258H 2 ohms 3500W 875W 120V 3
Please refer to: NOTES REGARDING LIMITER SETTINGS on page 5.

Page 18
IMPORTANT NOTES;
All wiring configurations shown above use 8-conductor speaker cables terminated with Neutrik NL4 "Speakons".
Ensure that each conductor in the cable is a minimum of #11 AWGuage (3-4 mm).
JBL VT4880:
The VT4880 has two 2258H drivers (8W) wired Independently =8W / 8W Pins 2± / 1±
JBL VerTec VT4880
Power Amplifier configurations - 2 or 4 Box Arrays

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