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MODE CONFIGURATIONS
DUAL A/B MODE 4
BRIDGE A/B MODE 8
OUTPUT MODE
SELECT
OUTPUTS A/ B
LOW Z
OUTPUTS C/D
All outputs in 70V mode
Example of a 70V constant-voltage distribution system:
Low Z or
70V Line
Low Z or
70V Line
Use of a 70 volt matching transformer is possible with a 140 volt system by connecting the tap that is rated for 1/4
power (or less) to the desired 70 volt tap. For example, a ceiling loudspeaker with a 70 volt input tapped for 20 watts
is to be used with a 140 volt constant-voltage system. The 140 volt system will need to be connected to the 5 watt
tap in order for the loudspeaker to produce 20 watts. If a 5 watt tap is not available, use the next lower tap.
CAUTION: Output voltages greater than 120 volts rms are available between the bridged terminals.
Class 3 wiring must be used in accordance with national and local codes to connect the loudspeaker
system.
200 WATTS/CHANNEL AT 4
CLASS 2 WIRING PERMITTED FOR 70V OUTPUTS
CLASS 3 WIRING REQUIRED FOR 140V OUTPUT
/70V
/140V
70V
C
A
-
+
+
-
D
B
200 WATTS/CHANNEL AT 4
CLASS 2 WIRING PERMITTED FOR 70V OUTPUTS
CLASS 3 WIRING REQUIRED FOR 140V OUTPUT
Dual-Dual Mono Mode
Dual-Dual Mono Mode
C
A
D
B
OR 70V OUTPUTS
Bridge Mode
C
70V line
+
-
70V line
+
-
D
200 WATTS/CHANNEL AT 4
CLASS 2 WIRING PERMITTED FOR 70V OUTPUTS
CLASS 3 WIRING REQUIRED FOR 140V OUTPUT
Outputs A/B in Bridge Mode
-
70V Line
+
BRIDGE
+
MODE
70V Line
-
OR 70V OUTPUTS
Total Load = 200 watts
+
140 V Line
BRIDGE
MODE
-
18
A
140V line
BRIDGE
MODE
B
OR 70V OUTPUTS
+
+
35 W
25 W
-
-
+
+
5 W
45 W
-
-
+
+
15 W
75 W
-
-
3 W
5 W
+
10 W
-
20 W
+
-
20 watts
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