User’s Manual
8 17
10.8. Power Output
The device is provided with a multi-way power
output
terminal
strip
for
constant-voltage
distribution (50, 70, 100 V) and low impedance (4
Ohms ) systems (20-23).
Constant voltage lines
50, 70, 100 V terminals should be used with each
loudspeaker equipped with impedance-matching
transformers and parallel connected. This fact
makes the system easy to create and, if any of the
loudspeakers should be disconnected from the
line for any reason, the rest of the system would
continue to function properly. The figure Fig3.
shows the connections of the line to these
sockets.
In order to achieve the maximum efficiency of the
system and to take precautions from amplifier bad
working, it is necessary to check the effective total
power handling of the loudspeakers that has to be
equal or lower than the RMS power value of used
amplifier. It’s a good rule arranging a 10-20%
safety margin on the amplifier power capability.
Constant impedance lines
4 Ohms terminal should be used.
In order to achieve the maximum efficiency of the
system and to take precautions from amplifier bad
working, it is necessary to check the effective
loading impedance of the lines. The total speakers
impedance should be equal or higher than pre-
selected value for connection.
To get that, each loudspeaker should be without
impedance-matching transformer and should be
connected in series or in series-parallel groups; In
any case loudspeakers should also have the
same power handling. The figure Fig4. shows the
connections of the line to these sockets.
70V
100V
70V
50V
COM
-
W
4
POWER OUTPUT
+
100V
100V
70V
50V
COM
-
W
4
POWER OUTPUT
+
70V
70V
100V
100V
Fig3. Constant Voltage Lines
100V
70V
50V
COM
-
W
4
POWER OUTPUT
+
100V
70V
50V
COM
-
W
4
POWER OUTPUT
+
8
W
Z tot= 4
W
Z tot= 4
W
8
W
W
4
W
4
W
4
W
4
Fig4. Constant Impedance Lines
