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
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
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
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 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.
JBL Professional Control 300 Series
5
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
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
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
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
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
at: www.jblpro.com
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
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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