JBL 7130 Effect Processor
Limiter / Compressor
compressor/limiter shall have an output capacity of
+18 dBm from 20 Hz-20 kHz, ±1 dB and total harmonic
distortion shall be less than 0.25% to +18 dBm, 20 Hz-20 kHz
in either the compression or limiting mode with up to 30 dB
of gain reduction.
The unit shall accept high impedance, unbalanced
microphones. The Microphone
preamplifier circuitry shall
employ field effect transistors for low noise. The
compressor shall be capable of any combination of line-line,
mic-mic, or line-mic operation. Balanced inputs shall be
possible by using optional input transformers. Outputs shall
be transformer isolated or direct for connection to a
balanced or unbalanced 600 ft line.
The compressor/limiter shall be equipped with a Selector
switch to place the unit in one of three modes of operation:
OUT, COMPRESS, or LIMIT. The normal threshold of compression
shall be 0 dBm output. An input level control shall vary the
gain when the Selector
switch is in the OUT mode. It shall
also determine the relative threshold when the unit is in
the COMPRESS or LIMIT mode. Two switches shall be provided
for the selection of three release times and three attack times.
The unit shall be equipped with a meter, governed by a
switch, which indicates amount of
compression or output level in dB. When indicating output
level, three ranges shall be selectable so that 0 VU on the
meter corresponds to an output level of 0 dBm, +4 dBm, or +8
dBm, unbalanced, and +2 dBm,
+6 dBm, or +10 dBm balanced output. The unit shall operate
on 120/240 V AC, 50/60 Hz.
Service and User Manual
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29 October 2017
Installation and Service Manual