JBL 300 Series, 328CT, 322CT, 321C manual Wiring Instructions, Hookup Schemes for Subsequent Speakers

WIRING INSTRUCTIONS

Control 300 Series Loudspeakers include Euroblock or Phoenix-type locking input connectors that allow the system to be “pre-wired” before the speakers are installed into their respective back cans and backboxes.

Connecting the Wiring to the Euroblock -- Connect the wiring to the removable locking connector that is INCLUDED with the speaker by stripping the insulation back about 5

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.

When wiring Control 300 Series loudspeakers, always use proper electrical wiring practices in accordance with your area’s building codes and regulations.

Guide to Connection Pins on Transformer Models (Control 328CT, 321CT & 322CT) -- The removable locking input connector contains 5 terminals, as marked on the connector. The pin functions are listed on the label located on the crossover frame.

Guide to Connection Pins on Low Impedance Models (Control 321C, 322C, 328C & 312CS) -- The removable locking input connector contains 4 terminals, as marked on the connector. The pin functions for the Control 328C, 328C and 322C are listed on the label located on the crossover frame and on the driver backplate on the Control 312CS.

Control 328C, 321C,	CONNECTION
322C & 312CS:
	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 & 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

Control 321CT & 328CT:

INPUT CONNECTION FROM
70V/100V AMPLIFIER LINE
A	B	C	D	E
70V Com 7.5W 15W 30W 60W
100V Com 15W		30W 60W		N/C
BLACK	WHITE	BLUE	PURPLE	ORANGE

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

Control 322CT:

INPUT CONNECTION FROM
70V/100V AMPLIFIER LINE
A	B	C	D	E
70V Com 12.5W 25W 50W 100W
100V Com 25W		50W 100W N/C
BLACK	WHITE	BLUE	PURPLE	ORANGE

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
					3	4
		1		2
	+		+		-	-
		IN	Loop Loop IN
			Thru		Thru
+						-

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 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.

-

From Amplifier or Previous Speaker

+

To Subsequent

Speakers

JBL Professional Control 300 Series 5