Control 312CS

High-Output 12 in. In-Ceiling Subwoofer Loudspeaker

Control 312CS
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High-Output 12 in. In-Ceiling Subwoofer Loudspeaker

Control 312CS is an excellent addition to JBL Control 321, 322 and 328 loudspeaker systems, or any fullrange loudspeaker system that requires extended bass response.


  • Kevlar-reinforced 300 mm (12 inch) subwoofer driver woofer with 75 mm (3 inch) voice-coil.
  • High power handling of 400 Watts with high sensitivity provides high SPL capability.
  • Clean, contemporary grille and optional back box available.


  Version Language Size Uploaded
file type icon Control 312CS Spec Sheet
en version B, updated: Feb 2024
en  187 KB Feb 2024
file type icon Ratio Guide for Control 312CS Subwoofers (18k)
updated: Oct 2020
    18 KB Oct 2020
file type icon Ceiling Speaker Accessory Guide
version B, updated: Jan 2024
  231 KB Jan 2024
file type icon Control 300 Brochure
updated: Apr 2019
    2.9 MB Apr 2019
file type icon Control Contractor Brochure (2024)
en version D, updated: Feb 2024
en  14 MB Feb 2024
CAD Drawings
file type icon Control 300 Ceiling Speakers
updated: Oct 2019
    1.39 MB Oct 2019
file type icon Control 300 Series Declaration of Conformity
updated: Oct 2019
    92.7 KB Oct 2019
file type icon JBL Control Series Passive Speakers DoC
updated: Dec 2019
    179 KB Dec 2019
file type icon CSC Ceiling Speaker Configurator Operating Instruction
updated: Oct 2019
    134 KB Oct 2019

If any of the links above result in strange characters in your browser, please right-click the file to save it to your computer.

Parts & Service


Frequency Range (±3 dB) 34 Hz – 3.5 kHz
Sensitivity 99 dB in ceiling near corner, 93 dB in center of ceiling
Frequency Range (-10dB) 30 Hz – 4.5 kHz
Maximum SPL (1m) 125 dB (low-impedance, 131 dB peak, center of ceiling)
119 dB (low-impedance, 125 dB peak near corner) 121 dB (optional MTC-300T150 70V/100V transformer, center of ceiling) 114 dB (optional MTC-300T150 70V/100V transformer, near corner)
Impedance 8 ohms
Power Rating AES Long-Term System Power Rating:
400 W continuous pink noise (1000 W peak), 2 hrs 250 W continuous pink noise (600 W peak), 100 hrs
Input Connectors Screw locking barrier strip for bare wire
Drivers 300 mm (12 in) subwoofer
Color White
Safety Agency Suitable for use in air handling spaces per UL1480, UL2043, NFPA90 & NFPA 70 when installed with UL listed backcan such as JBL MTC-300BB12. S7232/UL Listed, Signaling Speaker. Transformer UL registered per UL1876. In accordance with IEC60849/EN60849.
Backcan formed steel (wood-lined; accessory)
Baffle/Rim Metal, driver pre-mounted to baffle, ported.
Ceiling Cutout Size 378 x 378 mm (14.9 x 14.9 in) (for MTC-300BB12 backcan)
Included Accessories Ported baffle pre-attached.
Optional Accessories MTC-300SG12 Grille, square contoured, white. MTC-300BB12 Backbox, 80 liters (3 cubic feet)
Plenum Usage Yes, with accessory backcan
Coverage Angle Omnidirectional


MTC-300BB12 | 3 Cubic Ft. Backbox for Control 300 Series 12 in. Drivers
MTC-300BB12 Main photo
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3 Cubic Ft. Backbox for Control 300 Series 12 in. Drivers

Professional Series

  • Extra-thick 16 gauge metal construction.
  • Lined with 12 mm (½ inch) thick MDF to eliminate resonances and to provide extra bass response.
  • Knockouts on top and all four sides.
  • Dual mounting system for baffle.
  • Mounting platform for an optional high-power 70V/100V transformer.

MTC-300SG12 | Square Grille for Control 300 Series 12 in. Drivers
MTC-300SG12 Main photo
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Square Grille for Control 300 Series 12 in. Drivers

Professional Series

  • Rugged 19 gauge metal construction for enduring reliability.
  • Sculpted design for an elegant appearance and perfect for any decor or architectural setting.
  • Zinc underplating provides a rust and scratch resistant surface for years of maintenance free wear.
  • Powder coat final finish minimizes scratching and can easily be repainted to match any room color.

MTC-300T150 | 150 Watt Transformer
MTC-300T150 Main photo
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150 Watt Transformer

For use on either 70V or 100V distributed loudspeaker lines.



HARMAN Professional Solutions:

Control 312CS

High-Output 12 in. In-Ceiling Subwoofer Loudspeaker