JBL MTC-300BB12 Backbox For 12" Control 300 Series Drivers
Description
JBL MTC-300BB12 Backbox For 12" Control 300 Series Drivers
The MTC-300BB12 is a purpose-built enclosure designed to maximize the acoustic performance of JBL's 12-inch Control 300 series in-ceiling drivers. This backbox eliminates the acoustic compromises of mounting directly into drywall cavities, delivering controlled bass response and consistent directivity across installation environments. Built to professional specification, it handles both passive and powered 70V/100V distributed audio systems.
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 across varied ceiling and architectural conditions.
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.
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 provides the acoustic foundation necessary for reliable sound reinforcement, speech clarity, and music distribution in permanent installations—trusted by sound technicians and venue operators running networked audio systems.
More Information
| Condition | New |
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Reviews
At a Glance
The JBL MTC-300BB12 is a professional-grade backbox enclosure that maximizes the acoustic performance of 12-inch Control 300 series ceiling drivers in installed sound systems. Built with heavy-duty metal construction and MDF lining, it delivers controlled bass response and consistent directivity—eliminating the acoustic compromises of mounting directly into drywall cavities. Choose it for permanent installations requiring speech clarity, distributed audio, and predictable sound across varied venue spaces.
Who This Is For
Great for
- ✓ speech clarity
- ✓ distributed audio systems
- ✓ permanent installations
- ✓ background music
Not the best pick for
- – portable live sound
- – high-SPL concert reinforcement
Skill level: Professional
Frequently Asked Questions
What is a backbox and why do I need one?
A backbox is a professional enclosure that isolates the driver from drywall cavities and structural vibration, eliminating acoustic compromises and room-mode interference. It delivers controlled bass response, consistent directivity, and predictable acoustic behavior across different installation environments.
What ceiling drivers does this backbox fit?
The MTC-300BB12 is designed specifically for JBL's 12-inch Control 300 series in-ceiling drivers. It features a dual mounting system for standard baffle attachment and an integrated platform to support optional 70V/100V transformers.
Can this backbox handle 70V/100V distributed audio systems?
Yes, the MTC-300BB12 is built for both passive and powered 70V/100V distributed audio systems. Its integrated mounting platform eliminates the need for external transformer hardware, and five strategically positioned knockouts provide flexible routing for speaker wire and conduit.
Is this suitable for speech clarity and background music applications?
Yes, the controlled bass response and consistent directivity make it ideal for speech clarity, background music distribution, and permanent installed sound systems. The 12 mm MDF lining dampens cabinet resonances for clean, predictable audio across varied ceiling and architectural conditions.
What are the dimensions and installation considerations?
The backbox measures 587 mm (23.1") wide × 461 mm (18.2") deep × 308 mm (12.1") mounting height, with total height including tabs at 324 mm (12.6") and depth with side tabs at 505 mm (19.9"). It weighs 23.1 kg (51 lbs) and features five 22.1 mm knockouts on top, side, and end panels for flexible wire routing.