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JBL Professional Control 300 Series
WIRING INSTRUCTIONS
2.) Using Loop-Through Terminals (Pins 2 & 3) -- By
connecting the wire pair of the subsequent speaker to pins
2 & 3, then all subsequent speakers will be disconnected
when this speaker’s connector is disconnected during
troubleshooting . This can be useful as a way to isolate
problems to a section of the distributed line while leaving the
wires attached to the connector.
Figure D:
Loop-Through System
Hookup Diagram
Power Amp
+
-
1
2
3
4
Speaker 1
1
2
3
4
Speaker 3
1
2
3
4
Speaker 2
+
-
From Amplifier or
Previous Speaker
+
IN
1 2
-
Loop
Thru
+
-
+
3 4
-
IN
Loop
Thru
+
-
Figure C:
Using Loop-
Through Terminals
To Subsequent
Speakers
Control 227C
Figure B:
Parallel System
Hookup Diagram
Power Amp
+
-
1
2
3
4
Speaker 1
1
2
3
4
Speaker 3
1
2
3
4
Speaker 2
+
-