JBL Speaker 300 Series User Manual

3 0 0 S e r i e s  
C o n t r o l 3 21C / C T  
C o n t r o l 3 2 2 C / C T  
C o n t r o l 3 2 8 C / C T  
C o n t r o l 312 C S  
User’s Guide  
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PRODUCT DESCRIPTION  
JBL Professional Control® 300 Large Format, In-Ceiling Loudspeakers are designed from the  
ground up to provide optimal performance for the most demanding installed sound applications.  
Thanks to the conical constant coverage waveguide design, Control 300 Series Loudspeakers  
feature exceptional broadband control ensuring extremely even coverage and remarkably  
consistent performance. The Control 321C/CT, 322C/CT, 328C/CT and 312CS represent the  
state of the art in in-ceiling loudspeaker systems design.  
Control 321C - A coaxial design that features a 12” Kevlar-  
reinforced cone on the woofer coupled with JBL Professional’s  
2412 Compression Driver. The Control 321CT offers the same  
driver compliment as the Control 321C but also includes a multi-  
tap transformer for use on 70V or 100V line distribution systems.  
Control 322C - A coaxial design that also features a 12” Kevlar-  
reinforced cone on the woofer coupled with JBL Professional’s  
2407H Compression Driver and offers higher power handling  
capabilities than Control 321 models. The Control 322CT  
offers the same driver compliment as the Control 322C but also  
includes a multi-tap transformer for use on 70V or 100V line  
distribution systems.  
Control 328C - A smaller coaxial design that features a  
8” Kevlar-reinforced cone on the woofer coupled with JBL  
Professional’s 2412 Compression Driver. The Control 328CT  
offers the same driver compliment as the Control 328C and but  
includes a multi-tap transformer for use on 70V or 100V line  
distribution systems.  
Control 312C - An 8 ohm, 12” Kevlar-reinforced cone for  
extended bass requirements.  
JBL Professional Control 300 Series  
3
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PRODUCT FEATURE IDENTIFICATION  
(Control 322CT Shown)  
Transformer  
Compression  
Driver  
Crossover  
Network  
Tuning Port  
Tube  
Woofer Frame  
Baffle  
EZ-Rail™  
Dust Cap  
Crossover  
Network  
Woofer  
Tuning  
Port Tube  
Baffle  
Tuning Port  
4
JBL Professional Control 300 Series  
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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  
frame and on the driver backplate on the Control 312CS.  
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.  
Control 328C, 321C,  
CONNECTION  
322C & 312CS:  
1
2
3
4
+
+
-
-
Loop Loop  
Thru Thru  
IN  
IN  
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  
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 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.  
B
C
D
A
E
70V Com 7.5W 15W 30W 60W  
100V 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  
70V/100V AMPLIFIER LINE  
B
C
D
A
E
70V Com 12.5W 25W 50W 100W  
100V Com 25W 50W 100W N/C  
Figure A:  
Paralleling Input Terminals  
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 theCommonterminal  
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.  
JBL Professional Control 300 Series  
5
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WIRING INSTRUCTIONS  
Figure B:  
Parallel System  
Hookup Diagram  
+
-
1
2
3 4  
1
2
3 4  
1
2
3 4  
+
-
Speaker 1  
Speaker 3  
Speaker 2  
Power Amp  
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 C:  
Using Loop-  
Through Terminals  
1
2
3
4
+
+
-
-
IN Loop Loop IN  
Thru Thru  
+
-
-
+
From Amplifier or  
Previous Speaker  
To Subsequent  
Speakers  
Control 227C  
Figure D:  
Loop-Through System  
Hookup Diagram  
+
-
1
2
3 4  
1
2
3 4  
1
2
3 4  
+
-
Speaker 1  
Speaker 3  
Speaker 2  
Power Amp  
6 JBL Professional Control 300 Series  
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CONTROL 328C/CT SYSTEM ASSEMBLY  
Ceiling Preparation - Cut a 12.2 inch (310 mm)  
diameter hole in the ceiling to allow sufficient room for the  
loudspeaker baffle.  
IMPORTANT!  
When installing the  
MTC-300BB8 with a  
Control 328C/CT,  
see “Securing Speaker  
Assembly to the Building  
Structure” details below.  
Assembling the Control 328C/CT into the Back Can  
- After inserting the Control 328C/CT into the back can,  
align the mouting holes without weld nuts to the holes with  
clip nuts on the back can. These are the mounting points  
that will be used to secure the Control 328 baffle and driver  
to the backcan.  
Non-Weld nut  
mount point  
Weld nut  
mount point  
4 pcs - #10 x 0.75 in (19 mm)  
sheet metal screw for attaching  
the baffle / driver to the back  
can. Match to clip nuts on  
back can. (Included with MTC-  
300BB8. )  
Next, using 4 pcs - #10 x 0.75 in (19 mm) sheet metal  
screw, attaching the baffle / driver to the back can. Be  
sure to match the mouting holes without weld nuts to clip  
nuts on back can.  
4 pcs - M4 x 38 mm powder  
coated machine screws for  
attaching the metal grille to  
the baffle. (Included with JBL  
Professional grilles.)  
Finally, using 4 pcs - M4 x 38 mm powder coated machine  
screws, attach the metal grille to the baffle. Be sure to  
match the grille mouting holes to the weld nuts on the  
baffle assembly.  
IMPORTANT: SECURING SPEAKER ASSEMBLY TO THE BUILDING STRUCTURE  
The backcan must be secured to the building structure by qualified personnel in accordance with safe  
installation practices. Use suspension materials, connection fixturing, and methods that are appropriate for  
the building structure and installation conditions. Employ a minimum 5:1 safety factor for each suspension  
point, or higher if required by code. For MTC-300BB8 with a Control 328C/CT a 5:1 safety factor requires  
that each suspension point be rated to support a minimum of 57 kg (125 lbs).  
JBL Professional Control 300 Series  
7
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CONTROL 321C/CT, 322C/CT & 312CS SYSTEM ASSEMBLY  
MTC-300BB12 Back Box  
Shown as Cut-Away for Clarity  
Loudspeaker  
Pre-Mounted  
Metal Baffle  
Assembling the Control 321C/CT, 322C/CT or 312CS  
into the Back Box - First, line up the EZ-Rail™ with one  
of the back box flanges containing a singular mounting hole.  
For orientation when holding the speaker overhead, two  
(2) embossed arrows on the underside of the metal baffle  
indicate the edge with the EZ-Rail.  
1
Next, slide the EZ-Rail onto the flange of the JBL MTC-  
300BB12 (or compatible) back box. The EZ-Rail helps to  
hold one side of the speaker baffle TEMPORARILY while  
the installer installs the screws that hold the baffle.  
IMPORTANT: THE INSTALLER MUST SECURE THE  
BAFFLE IN PLACE WITH SCREWS ON ALL SIDES.  
2
8 JBL Professional Control 300 Series  
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CONTROL 321C/CT, 322C/CT & 312CS SYSTEM ASSEMBLY  
Ceiling Preparation - Cut a 14.9 x 14.9 inch  
(378 x 378 mm) hole in the ceiling to allow  
sufficient room for the loudspeaker baffle.  
IMPORTANT!  
Using JBL Professional’s MTC-300BB12  
Back Box -- The MTC-300BB12 is  
compatible with two common mounting  
systems for installing the loudspeaker  
/ baffle to the back box; either of these  
mounting systems may be utilized. Screws  
are included with the MTC-300BB12 Back  
Box.  
When installing the  
MTC-300BB12 with  
a Control 321C/CT,  
322C/CT & 312CS  
models see “Securing  
Speaker Assembly to  
the Building Structure”  
details below.  
2 Points Each Side  
Using 4 pcs - M4 x 38mm powder coated  
machine screws, attach the metal grille  
to the baffle. Be sure to match the grille  
mouting holes to the weld nuts on the baffle  
assembly.  
1 Point Each End  
4 pcs - M4 x 38mm powder  
coated machine screws for  
attaching the metal grille to  
the baffle. (Included with JBL  
Profesional grilles.)  
6 pcs - #10 x .75 in (19mm) sheet  
metal screw for attaching the  
driver / baffle to the back box.  
Match to clip nuts on back box.  
Using a different brand compatible back box  
-- Screwholes in the metal baffle are provided  
corresponding with two common mounting systems.  
Utilize the system that works with that particular  
back box.  
1 Point Each Corner  
4 pcs - M4 x 14mm sheet metal  
screw for attaching the driver /  
baffle to the back box. Match to  
corners on back box.  
IMPORTANT: SECURING SPEAKER ASSEMBLY TO THE BUILDING STRUCTURE  
The backcan must be secured to the building structure by qualified personnel in accordance with safe  
installation practices. Use suspension materials, connection fixturing, and methods that are appropriate for  
the building structure and installation conditions. Employ a minimum 5:1 safety factor for each suspension  
point, or higher if required by code. For MTC-300BB12 with a Control 321C/CT, 322C/CT or 312CS, a 5:1  
safety factor requires that each suspension point be rated to support a minimum of 156 kg (345 lbs).  
JBL Professional Control 300 Series  
9
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ACCESSORIES, MAINTENANCE & CONTACTING JBL  
Painting the Grille -- Control 300 Series Grilles feature Contacting JBL Professional -- These products are  
a powder coated, satin finish paint (RAL 9016 - Pantone designed and backed by JBL Professional, the world  
equivalent 11-0602TPX) and can be painted to match any leader in professional sound reinforcement. For complete  
decor. This should only be done when the grilles have warranty information, to order replacement parts or to ask for  
been removed from their loudspeaker and back box / can clarifications to this manual, contact JBL Professional.  
assembly.  
Within the United States:  
For best results, a spray paint technique is recommended.  
If the grille is rolled or brush painted, the grille perforations Applications Department, JBL Professional  
may become clogged with paint and poor sound quality may 8400 Balboa Blvd., PO Box 2200  
result.  
Northridge, CA 91329 USA  
In the USA you may call Monday through Friday 8:00am to  
5:00pm Pacific Coast Time (818) 894-8850.  
Maintenance--Nomaintenanceisrequiredwhenassembled  
in accordance with the instructions and wiring guidelines Outside the USA:  
described in this manual.  
Contact the JBL Professional Distributor in your country.  
A list of JBL Professional Distributors and US Service  
Centers can be obtained from the JBL Professional website  
Optional Accessories  
MTC-RG6/8 Grille - a round, contoured grille for use with the  
Control 328C/CT Loudspeaker System.  
MTC-300BB8 Backbox - a round, one cubic foot (nominal, back-  
box for use with the Control 328C/CT Loudspeaker System.  
MTC-300SG12 Grille - a square, contoured grille for use with  
the Control 321C/CT, 322C/CT & 312CS Loudspeaker Systems.  
MTC-300BB12 Backbox - a round, three cubic foot (nominal), for  
use with the Control 321C/CT, 322C/CT & 312CS Loudspeaker  
Systems.  
MTC-300T150 Transformer - a 100V, 150W (plus 75W at 70V)  
transformer for applications requiring high power.  
10 JBL Professional Control 300 Series  
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SPECIFICATIONS  
Control 328C/CT  
Frequency Range (-10 dB)1: 45 Hz – 18 kHz  
LISTED  
Frequency Response ( 3 dB)1: 60 Hz – 16 kHz  
General Signaling  
Equipment  
15CM  
Coverage Pattern2: 120º conical, broadband (Avg 1k - 16kHz)  
Long-Term System Power Rating, IEC3: 250 W (1600 W peak), 2 hrs  
150 W (1000 W peak), 100 hrs  
Sensitivity (2.83V@ 1m): 93 dB4 measured half-space  
Nominal Impedance : 8 ohms (328C)  
Transformer Taps : 100V: 68W, 34W & 17W (plus 8.5W at 70V)  
Transducers : 8” woofer with Kevlar reinforced cone, 1” exit magnet compression driver  
Input Connector : Removable locking connector with screw-down terminals.  
Safety Agency Rating : Suitable for use in air handling spaces, per U.L.-2043, U.L.-1480, NFPA90 & NFPA70A.  
Net Weight : 328C: 4.5 kg (10.0 lbs) 328CT: 5.4 kg (12.0 lbs)  
Dimensions (Diameter x D) : 328C: Ø 305 mm (12 in) x 160 mm (6.3 in)  
328CT: Ø 305 mm (12 in) x 218 mm (8.6 in)  
Control 321C/CT  
Frequency Range (-10 dB)1: 34 Hz – 18 kHz  
Frequency Response ( 3 dB)1: 47 Hz – 16 kHz  
Coverage Pattern2: 90º conical, broadband (Avg 1k - 16kHz)  
Long-Term System Power Rating, IEC3: 250 W (1600 W peak), 2 hrs  
200 W (1000 W peak), 100 hrs  
Sensitivity (2.83V@ 1m): 94 dB4 measured half-space  
Nominal Impedance : 8 ohms (321C)  
Transformer Taps : 100V: 68W, 34W & 17W (plus 8.5W at 70V)  
Transducers : 12” woofer with Kevlar reinforced cone, 1” exit magnet compression driver  
Input Connector : Removable locking connector with screw-down terminals.  
Safety Agency Rating : Suitable for use in air handling spaces, per U.L.-2043, U.L.-1480, NFPA90 & NFPA70A.  
Net Weight : 321C: 7.3 kg (16.0 lbs) 321CT: 8.2 kg (18.0 lbs)  
Dimensions (H x W x D) : 321C: 366 x 366 x 223 mm (14.4 x 14.4 x 8.8 in) depth from back of baffle  
321CT: 366 x 366 x 240 mm (14.4 x 14.4 x 9.5 in) depth from back of baffle  
Control 322C/CT  
Frequency Range (-10 dB)1: 32 Hz – 20 kHz  
Frequency Response ( 3 dB)1: 48 Hz – 19 kHz  
Coverage Pattern2: 90º conical, broadband (Avg 1k - 16kHz)  
Long-Term System Power Rating, IEC3: 400 W (1600 W peak), 2 hrs  
250 W (1000 W peak), 100 hrs  
Sensitivity (2.83V@ 1m): 95 dB4 measured half-space  
Nominal Impedance : 8 ohms (322C)  
Transformer Taps : 100V: 100W, 50W & 25W (plus 12.5W at 70V)  
Transducers : 12” woofer with Kevlar reinforced cone, 1” exit neodymium-magnet compression driver  
Input Connector : Removable locking connector with screw-down terminals.  
Safety Agency Rating : Suitable for use in air handling spaces, per U.L.-2043, U.L.-1480, NFPA90 & NFPA70A.  
Net Weight : 322C: 9.1 kg (20.0 lbs) 322CT: 10.0 kg (22.0 lbs)  
Dimensions (H x W x D) : 322C: 366 x 366 x 223 mm (14.4 x 14.4 x 8.8 in) depth from back of baffle  
322CT: 366 x 366 x 240 mm (14.4 x 14.4 x 9.5 in) depth from back of baffle  
Control 312CS  
Frequency Range (-10 dB)1: 30 Hz – 4.5 kHz  
Frequency Response ( 3 dB)1: 34 Hz – 3.5 kHz  
Long-Term System Power Rating, IEC5: 400 W (1600 W peak), 2 hrs  
250 W (1000 W peak), 100 hrs  
Sensitivity (2.83V@ 1m): 93 dB4 measured half-space  
Nominal Impedance : 8 ohms  
Transducers : 12” woofer with Kevlar reinforced cone  
Input Connector : Removable locking connector with screw-down terminals.  
Safety Agency Rating : Suitable for use in air handling spaces, per U.L.-2043, U.L.-1480, NFPA90 & NFPA70A.  
Net Weight : 312CS: 7.7 kg (17.0 lbs)  
Dimensions (H x W x D) : 312CS: 366 x 366 x 160 mm (14.4 x 14.4 x 6.3 in) depth from back of baffle  
1 In half space (in ceiling)  
2 Average 1 kHz to 16 kHz  
3 IEC standard, full bandwidth pink noise with 6 dB crest factor.  
4 Measured in half space (in ceiling), ave 100 Hz – 10 kHz.  
5 AES pink noise, 30 Hz to 300 Hz with 6 dB crest factor.  
JBL continually engages in research related to product improvement. Changes introduced into existing products without notice are an expression of that philosophy.  
JBL Professional Control 300 Series  
11  
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3 0 0
 
S e r i e s  
8500 Balboa Boulevard  
Northridge, CA 91329 USA  
363816-001  
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