Telephone Connection
This input is for emergency announcements/signals. Input level can be set by level control on the
rear panel. The TEL input has the highest priority and will override all other inputs.
Aux Connection
This amplifier provides an auxiliary input which may be used for connecting other signal sources
such as a radio tuner, CD player or cassette player. Turn the volume control clockwise to increase
the volume or anticlockwise to reduce the volume.
The Aux input sockets are standard RCA phono, two sockets are supplied and these are linked
together internally. This allows stereo signal sources to be used without the need to obtain a
special lead, however you may wish to check with the manufacturer of the signal source to ensure
that no damage will result if the left and right output channels are put in parallel.
RCA Phono plug connections
Line Output Connection
This amplifier is equipped with two booster output sockets which can be used to drive a booster
amplifier in situations where more power is required. Connection is via RCA phono plugs (See
above).
Loudspeaker Connection
This amplifier has got four different types of loudspeaker output, these are 100V, 70V and 25V line
output, and low impedance output. You can only use one of these outputs at a time, any attempt to
use two or more of these may result in damage to the amplifier.
100V Line
These loudspeakers are most commonly used in the Europe for PA distribution. When the
amplifier is at full output, 100V RMS will be present at the output terminals. Only use 100V line
loudspeakers with this output. All loudspeakers should be wired in parallel and the sum of the
power tapping of each loudspeaker must not exceed the rated output of the amplifier, due to the
nature of the loudspeaker and transformer impedance. It is advisable not to load the amplifier to
more than 70% of its rated output when using music sources.
70V / 25V Line
This system is common in the USA, it operates on exactly the same principals as 100V line except
that at rated output the amplifier will have 70V RMS or 25V RMS on its output terminals.
Low Impedance (8Ω)
This output allows connection of standard low impedance loudspeakers, the minimum load
impedance must be 8Ω. When two or more loudspeakers are used, ensure that they are wired in
such a way that the load impedance is between 8Ωand 16Ω.
Sleeve: Screen
Pin: Signal
