JBL Control 226C/T User Manual page 8

On the Control 227CT, connect the negative input to the
"Common" terminal and connect the positive input to the
appropriate tap. For example, if the system is being driven
from a 70V Distributed Line and the 30W tap is desired, the
positive input would be made to the input marked 30W and
the negative connection would be made to the "Common"
pin. The input pins correspond to the taps of the transformer
indicated on the label below each connector.
Guide to Connection Pins on Control 227C -- The
removable locking input connector contains 4 terminals, as
marked on the connector. The pin functions are listed on the
label located on the crossover frame.
Control 227C:
Pins 1 & 4 are the "+" and "-" inputs to the loudspeaker.
Connect the negative wire to "-" or pin 4 and connect the
positive wire to "+" or pin 1. Pins 1 & 4 are looped to pins 2 &
3, respectively (Pin 1 connects to Pin 2 and Pin 3 connects
to Pin 4) inside the speaker. Pins 2 & 3 are intended as loop-
through connections to subsequent loudspeakers. There are
two possible hookup schemes for connecting subsequent
speakers, determined by the desired result from the circuit
whenever this speaker's connector gets disconnected during
troubleshooting.
Hookup Schemes for Subsequent Speakers
Choose whichever of the following hookup patterns best
accommodates your installation.
1.) Paralleling Input Terminals -- Connect the wire pair of
the subsequent speaker to pins 1 & 4 (in parallel with the
input wire pair). Whenever the connector is pulled out of the
speaker for troubleshooting, subsequent speakers will stay
connected. This can be useful during troubleshooting to be
able to disconnect a single loudspeaker at a time. In this
hookup scheme, no wires get connected to pins 2 & 3.
Figure A:
Paralleling Input Terminals
+
-
From Amplifier or
Previous Speaker
6 JBL Professional Control 200 Series
WIRING INSTRUCTIONS, CON'T
CONNECTION
1 2 3 4
- -
+ +
Loop Loop
IN IN
Thru Thru
1 2 3 4
+ +
- -
IN Loop Loop IN
Thru Thru
-
+
To Subsequent
Speakers
Figure B:
Parallel System
Hookup Diagram
1 2 3 4
+
- Speaker 1
Power Amp
2.) Using Loop-Through Terminals (Pins 2 & 3 on Control
227C, Pins A & B on Control 226C/T) -- By connecting
the wire pair of the subsequent speaker to pins 2 & 3 on
the Control 227C and Pins A & B on Control 226C/T, 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 C:
Using Loop-
Through Terminals
+
-
From Amplifier or
Previous Speaker
+
-
From Amplifier or
Previous Speaker
Figure D:
Loop-Through System
Hookup Diagram
1 2 3 4
+ - Speaker 1
Power Amp
1 2 3 4 1 2 3 4
Speaker 3
Speaker 2
1 2 3 4
+
+ -
-
IN Loop Loop IN
Thru Thru
-
+
To Subsequent
Control 227C
Speakers
1 2
+
-
IN IN
A B
-
+ -
Loop Loop
Thru Thru
+
To Subsequent
Control 226C/T
1 2 3 4
1 2 3 4
Speaker 3
Speaker 2
+
-
Speakers
+
-