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4.3 Additional AF output (0 dB)
The additional AF output (10) is unbalanced. It serves for controlling other
power amplifiers. If these amplifiers have a balanced input, the shield is bridged with
one of the signal inputs (pin 1 and 3). The AF output (10) allows the selection
between:
1 = Microphone master
2 = Microphone and line master before insert and volume control
3 = Microphone and line master after insert and volume control
The selection is done using the jumpers (refer to chapter “9. Top view printed
circuit board”).
4.4 Loudspeaker connection
The loudspeaker is connected to the loudspeaker socket (15). The output
voltage of this socket is 100 V at full modulation. Low-impedance loudspeakers with
an impedance of 4 to 16 Ω can be connected to the terminals 4 - 16 and COM of the
terminal board (16).
Caution:
A simultaneous operation of 100 V and low-impedance loudspeakers will
destroy the amplifier!
The MA 212 mixer amplifier is suitable for the connection of loudspeakers with 100
V-matching transformer. If these loudspeakers are connected to a 100 V amplifier
output, they receive the full power depending on the matching. All the connected
loudspeakers or their power matching result in the total power consumption. The
total power consumption must not exceed the rated amplifier power, or the amplifier
may be damaged.
4.5 Record Output
The record output (11) is unbalanced (0 dB), for the connection of recorders.
The audio signal is the master of the microphone and auxiliary inputs before the
equalisation and volume controls.
4.6 Insert
The insert socket (9) is unbalanced. External signal processing devices such as
equaliser, shifter etc. can be connected. The master can be chosen before or after the
equalisation control (refer to chapter “9. Top view printed circuit board”). If no plug
is connected, the signal path is switched through.