User manual JBL Control 328CT

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WIRING INSTRUCTIONS  
Control 300 Series Loudspeakers include Euroblock or Guide to Connection Pins on Low Impedance Models  
Phoenix-type locking input connectors that allow the system (Control 321C, 322C, 328C & 312CS) -- The removable  
to be “pre-wired” before the speakers are installed into their locking input connector contains 4 terminals, as marked on  
respective back cans and backboxes.  
the connector. The pin functions for the Control 328C, 328C  
and 322C are listed on the label located on the crossover  
Connecting the Wiring to the Euroblock -- Connect the frame and on the driver backplate on the Control 312CS.  
wiring to the removable locking connector that is INCLUDED  
Control 328C, 321C,  
with the speaker by stripping the insulation back about 5  
CONNECTION  
3
22C & 312CS:  
mm (about 3/16 inch), inserting the bare end of wire into  
the connector and screwing down the hold-down screw until  
tight using a small flatblade screwdriver. Tighten any unused  
screws to avoid vibration. Using terminal block connectors  
allows the system to be pre-wired before final installation of  
the drivers.  
1
2
3
4
+
+ - -  
IN Loop Loop IN  
Thru Thru  
Pins 1 & 4 are the “+” and “-” inputs to the loudspeaker.  
Connect the negative wire to the “-” or pin 4 and connect the  
positive wire to “+” or pin 1. Pins 1 & 4 are looped to pins 2 &  
When wiring Control 300 Series loudspeakers,  
always use proper electrical wiring practices  
in accordance with your area’s building codes  
and regulations.  
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  
Guide to Connection Pins on Transformer Models two possible hookup schemes for connecting subsequent  
Control 328CT, 321CT & 322CT) -- The removable locking speakers, determined by the desired result from the circuit  
(
input connector contains 5 terminals, as marked on the whenever this speaker’s connector gets disconnected during  
connector. The pin functions are listed on the label located troubleshooting.  
on the crossover frame.  
Hookup Schemes for Subsequent Speakers  
Control 321CT & 328CT:  
INPUT CONNECTION FROM  
70V/100V AMPLIFIER LINE  
Choose whichever of the following hookup patterns best  
accommodates your installation.  
A
B
C D  
E
7
0V Com 7.5W 15W 30W 60W  
1
00V Com 15W 30W 60W N/C  
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.  
Control 322CT:  
INPUT CONNECTION FROM  
7
0V/100V AMPLIFIER LINE  
A
B
C D  
E
7
00V Com 25W 50W 100W N/C  
0V Com 12.5W 25W 50W 100W  
Figure A:  
Paralleling Input Terminals  
1
1
2
3
4
+
+
-
-
IN Loop Loop IN  
Thru Thru  
+
-
-
From Amplifier or  
Previous Speaker  
+
To Subsequent  
Speakers  
For Control 328CT, 321CT and Control 322CT (transformer  
models), 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 in the case of the Control 321CT the 30W tap is  
desired, the positive input would be made to the input marked  
3
0W 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.  
JBL Professional Control 300 Series 5  

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