JBL MTC-300BB12 Backbox For 12" Control 300 Series Drivers

JBL MTC-300BB12 Backbox For 12" Control 300 Series Drivers

The MTC-300BB12 is a purpose-built enclosure designed to unlock the full acoustic potential of JBL's 12-inch Control 300 series in-ceiling drivers in studio monitoring and production environments. This backbox eliminates the acoustic compromises of mounting directly into drywall cavities, delivering controlled bass response and consistent directivity that translates reliably across your monitoring chain and mixing decisions. Built to professional specification, it handles both passive and powered 70V/100V distributed audio systems, making it ideal for multi-room studio facilities and networked monitoring setups.

Construction & Acoustic Design

Heavy-duty 16 gauge metal construction paired with 12 mm MDF lining effectively damps cabinet resonances and extends bass response without bloat. This rigid enclosure isolates the driver from structural vibration and room modes, ensuring predictable acoustic behavior that remains stable during critical mixing and mastering sessions, regardless of ceiling construction or room acoustics.

Installation & Compatibility

The dual mounting system accommodates standard baffle attachment, while an integrated platform supports optional high-power 70V/100V transformers—eliminating the need for external mounting hardware. Strategically positioned five knockouts (22.1 mm diameter) on top and side panels provide flexible routing for speaker wire, conduit, and system connections without compromising structural integrity, streamlining your studio wiring and signal flow.

Key Features

• 16 gauge heavy-duty metal construction for rigidity and durability
• 12 mm MDF lining eliminates resonances and enhances bass response
• External volume: 3 cubic feet; Internal volume: 2.4 cubic feet
• Dimensions: 587 mm (23.1") wide × 461 mm (18.2") deep × 308 mm (12.1") mounting height
• Total height including tabs: 324 mm (12.6")
• Depth with side tabs: 505 mm (19.9")
• Dual mounting system for baffle compatibility
• Integrated mounting platform for optional 70V/100V transformer
• Five 22.1 mm (0.87") knockouts—one on top panel, one on each side and end panel
• Shipping weight: 23.1 kg (51 lbs)

The MTC-300BB12 establishes the acoustic foundation necessary for accurate monitoring, transparent mix translation, and professional-grade sound production in studio installations and networked recording facilities.