JBL 300 Series User Manual Download Page 3

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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

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.

Summary of Contents for 300 Series

Page 1: ...C o n t r o l 3 2 1C 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 3 12 C S User s Guide 3 0 0 S e r i e s...

Page 2: ...ion Wiring Instructions Control 328C CT System Assembly Control 321C CT Control 322C CT Control 312CS System Assembly Painting the Grille Maintenance Accessories Contacting JBL Professional Specificat...

Page 3: ...ial 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 bu...

Page 4: ...300 Series PRODUCT FEATURE IDENTIFICATION Control 322CT Shown Transformer Compression Driver Woofer Frame Baffle Crossover Network Tuning Port Tube EZ Rail Baffle Tuning Port Crossover Network Dust C...

Page 5: ...N C 100V BLACK ORANGE PURPLE BLUE WHITE Control 321CT 328CT Control 322CT 1 4 3 2 Loop Thru IN IN Loop Thru CONNECTION Control 328C 321C 322C 312CS Control 300 Series Loudspeakers include Euroblock or...

Page 6: ...s 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 D Loop Through System Hookup Diagram Power Amp 1 2 3 4 Speake...

Page 7: ...he baffle assembly 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 4 pcs M4 x 38 mm powder coated mac...

Page 8: ...erhead two 2 embossed arrows on the underside of the metal baffle indicate the edge with the EZ Rail Next slide the EZ Rail onto the flange of the JBL MTC 300BB12 or compatible back box The EZ Rail he...

Page 9: ...ch 378 x 378 mm hole in the ceiling to allow sufficient room for the loudspeaker baffle Using JBL Professional s MTC 300BB12 Back Box The MTC 300BB12 is compatible with two common mounting systems for...

Page 10: ...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 nom...

Page 11: ...ector 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...

Page 12: ...363816 001 8500 Balboa Boulevard Northridge CA 91329 USA Visit us online at www jblpro com 3 0 0 S e r i e s...

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