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

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.

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