JBL VT4889, VT4888, VT4880 manual VT4887 & VT4881 Transducer Complement, 2407H, 2104H, 2168J, 2256G

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 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 position.

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.

VT4887 & VT4881 Transducer Complement:

 

 

 

 

Nominal

Nominal

AES Power

Peak

Recommended

 

Model

Speakon NL8

Per

Impedance

Impedance

100 HR

Power

 

Power per

 

Terminals

box

per

per

Rating per

Rating per

 

 

Passband

 

 

 

 

Transducer

Passband

Transducer

Transducer

 

 

 

 

 

HF

2407H

Pins 4± 1

x 2

8Ω

8Ω

25W

100W

450W

MF

2104H

Pins 4± 1

x 4

8Ω

8Ω

50W

200W

450W

LF

2168J

Pins 3± 2

x 2

16Ω

8Ω

350W

1400W

1000W

VLF

2256G

Pins 1± & 2± 3

x 1

2 x 8Ω

8Ω + 8Ω

600W

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.

Page 5

Image 5
Contents Array Applications Manual Table of Contents VT4889 General Amplification Notes & RequirementsStandard Amplification Rack 2407H VT4887 & VT4881 Transducer Complement2104H 2168JMA-3600 VZ MA-5002VZCh2 VT4887 VT4881JBL VT4887 JBL VT4881Amplifier Configurations 4 VT4888 / 4 MA-5002VZ Amplifier Configurations 4 VT4888 / 3 MA-5002VZVT4888 Transducer Complement MA-5002VZ Ch2Amplifier Configurations 6 VT4888 / 4 MA-5002VZ JBL VT4888 JBL Vertec VT4888 Line ArrayAmplifier Configurations 4 VT4889 / 4 MA-5002VZ Amplifier Configurations 4 VT4889 / 3 MA-5002VZAmplifier Configurations 2 VT4880 / 1 MA-5002VZ Amplifier Configurations 6 VT4889 / 4 MA-5002VZVT4880 Transducer Complement 2258HJBL VT4889 JBLVerTecVT4889 Line ArrayArrays of similar Vertec Model Vertec Systems Suspension Hardware & Assembly NotesVertec Systems Suspension Frames & Hinge Bars Vertec VT4888, VT4887, VT4881 Systems Suspension Frames Vertec Systems Suspension Hinge Bars VT4889 with VT4887 attached using VT4800-DA Typical 8-BOX Hanging Array Vertec Support Team