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JBL’s MTC-300BB12 Three-Cubic-Foot Backbox features extra-thick 16-gauge metal construction and a thick resonance-eliminating lining that also provides extra bass response. Made for the Control 300 Series 12″ Drivers, this backbox has a dual-mounting system for baffle and knockouts on all four sides.

This back box has a five-year warranty from JBL Professional.

Extra-Thick Construction
Strong and durable, this back box is made of 16-gauge metal.
MDF Lining
With 0.5″ of medium-density fiberboard lining, this backbox is constructed to eliminate extra resonance and increase bass response.

6 in stock

3 Cubic Ft. Backbox for Control 300 Series 12 in. Drivers


  • 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.


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