INSTALLATION
AC Mains Supply.
The unit is fitted with an internationally approved 3 pin IEC connector. A mating socket with power cord is
provided with the unit, wired as follows:
Brown: Live.
Blue: Neutral.
Green/Yellow: Earth (Ground).
All mains wiring should be performed by a qualified electrician with all power switched off, and the earth
connection must be used.
Before connecting the unit to the supply, check that the voltage selector switch on the rear panel is correctly
set. The unit may be set for 115V (accepting voltages in the range 110V to 120V, 60Hz AC), or to 230V
(for voltages in the range 220V to 240V, 50Hz AC). Adjustment to the operating voltage should be made
by sliding the selector switch left or right with a small screwdriver until the desired voltage is displayed. The
mains fuse required is 20mm anti-surge, 1AT rated at 250V. If it ever necessary to replace the fuse, only
the same type and rating must be used. The power consumption of the equipment is 30VA.
Warning: attempted operation on the wrong voltage setting, or with an incorrect
fuse, will invalidate the warranty.
Audio Operating Level.
The compressor is equipped with inputs and outputs suitable for connection to a wide variety of other audio
equipment. Generally, the balanced XLR connections will be required for interfacing to other professional
equipment, where the operating level (line-up level or nominal level) will be +4dBu, or about 1.2V rms. The
unbalanced jack connectors are generally intended for interfacing to semi-professional equipment and have
an operating level of -10dBu, or about 225mV rms.
The compressor may be used to change between operating levels, for example by connecting the
unbalanced output of a semi-pro mixing console to the compressor’s unbalanced input, and taking the
balanced output of the compressor to the balanced input of a tape machine at +4dBu. All inputs and
outputs of the compressor may be used simultaneously if required. Balanced interconnection is always
preferable to obtain the best headroom and noise rejection, but can only be used if the other equipment in
the chain, e.g. the mixing console, also has provision for balanced connections.
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