JBL MTC-300BB8 Backbox For 8" Control 300 Series Drivers

JBL MTC-300BB8 Backbox For 8" Control 300 Series Drivers

The MTC-300BB8 is a professional-grade enclosure engineered to mount flush with suspended ceilings, providing the acoustic foundation needed for in-ceiling speaker installations in studios, control rooms, and broadcast facilities. Its compact footprint and robust construction make it the essential choice for integrators pairing JBL's 8-inch Control 300 drivers with properly tuned baffle designs.

Construction & Acoustic Design

Built from 16 gauge metal with 12 mm MDF lining, this backbox eliminates resonances and delivers extended bass response from relatively modest dimensions. The interior volume of 0.71 cubic feet is precisely engineered to complement the 8-inch driver's performance characteristics, providing a controlled acoustic environment without demanding excessive ceiling cavity space.

Installation & Workflow Integration

The 310 mm (12.2 in) ceiling cutout integrates seamlessly into standard drop-ceiling grids, while five knockout locations (one on top, four on sides) accommodate various cable routing configurations for flexible system layouts. Full certification under U.L.-2043, U.L.-1480, NFPA90, and NFPA70A ensures safe operation in air-handling plenums and other regulated recording spaces.

Key Features

• Extra-thick 16 gauge metal construction for durability and vibration control
• 12 mm (½ inch) thick MDF lining to eliminate resonances and extend bass response
• External volume: 1.0 cubic foot nominal
• Internal volume: 0.71 cubic foot
• Outside diameter: 380 mm (15.0 inches)
• Inside diameter: 273 mm (10.7 inches)
• Height: 259 mm (10.2 inches) above ceiling / 268 mm (10.6 inches) total height
• Ceiling cutout size: 310 mm (12.2 inches)
• Five knockout locations: 22.1 mm (0.87 inch) diameter openings for flexible wiring
• Net weight: 5.2 kg (11.5 lbs) / Shipping weight: 7.9 kg (16.5 lbs)
• U.L.-2043, U.L.-1480, NFPA90, and NFPA70A certified for air handling spaces
• Designed specifically for JBL 8-inch Control 300 series drivers

The MTC-300BB8 delivers the rigorous engineering and acoustic standards required for professional studio installations where consistent monitoring and code adherence are non-negotiable.