5
Signal Inputs
Each channel can be connected by either
of the XLR type connectors. The female
and male XLR connector are wired in
parallel to enable amplifier inputs to be
linked together for large sound systems.
The inputs are balanced and should be
wired in accordance with BS5428 part
5/3 and IEC-268 part 12:
Pin 1
Screen
Pin 2
Positive phase
Pin 3
Negative phase
For unbalanced inputs either the screen
and negative phase should be connected
together or the input can be wired signal
to the positive phase, screen to the
negative phase. DO NO T leave either of
the negative or positive phase inputs
unconnected as this will result in a
reduced output level and increased noise.
Amplifier Outputs
Two Speakon type connectors are
provided for each channel. The minimum
load impedance is 4
S
. The connectors are
wired:
Pin 1- Ground
Pin 1+
Signal
In the bridge mode the output should be
taken between pin 1+ of each channel.
A.C. Power Input
The AC pow er is supplied via a 3 pin IEC
Euro-Connector moulded plug and cable
which is supplied with the amplifier. The
free end of the cable is not supplied with
a 3 pin plug so that the cable can be wired
into the equ ipmen t rac k po w er
distribution system.
The lead should be wired using the
following code:
Green/Yellow
Earth
Brown
Live
Blue
Neutral
CAUTION - THIS AMPLIFIER MUST
BE CONNECTED TO EARTH ,
FAILURE TO DO SO COULD BE
FATAL.
DO NOT disconnect the green/yellow
mains safety earth. This amplifier has a
special electronic circuit to eliminate
hum loops.
D.C.Fuses
There are two 20mm D.C. fuses for
each amplifier, one for the positive and
one for the negative power supply and
they are rated at 6.3A quick blow.
Before changing a fuse turn the
amplifier mains switch off and
disconnect the mains supply from the
amplifier.
INTERNAL FACILITIES
Bridge Switch
The bridge switch is located inside the
amplifier behind the bridge LED so that
it is not inadvertently operated and
therefore requires the removal of the lid
to operate it. When the switch is in the
bridge position the green LED will be
illuminated. Caution You should
disconnect the mains supply before
removing the amplifier lid.
Voltage Selector
The voltage selector is located inside
the amplifier on the slow start P.C.B. It
is set at 240v at the factory. To change
voltage settings the lid of the amplifier
will require removal and this is done by
unscrewing the 6 screws in the lid.
Caution Disconnect the mains supply
before opening the lid.
The selector link is coloured red and is
inserted into the required sockets.
