JBL MTC-300BB8 Backbox For 8" Control 300 Series Drivers B-Stock
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- SKU
- MTC-300BB8-B
Description
JBL MTC-300BB8 Backbox For 8" Control 300 Series Drivers
The MTC-300BB8 is a professional-grade enclosure engineered for in-ceiling speaker installations in venues, installations, and commercial spaces. Built to mount flush with suspended ceilings, this backbox provides the acoustic foundation and structural integrity needed to support consistent performance from JBL's 8-inch Control 300 drivers in touring rigs, fixed installations, and sound reinforcement systems.
Construction & Acoustic Design
Built from 16 gauge metal with 12 mm MDF lining, this backbox eliminates resonances and delivers extended bass response from a compact footprint. The interior volume of 0.71 cubic feet is precisely engineered to complement the 8-inch driver's performance characteristics, allowing you to get full-range output without requiring excessive ceiling cavity space or additional bracing.
Installation & Compliance
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 fast setup and changes. Full certification under U.L.-2043, U.L.-1480, NFPA90, and NFPA70A ensures safe operation in air-handling plenums and other regulated spaces, protecting your investment and guaranteeing code compliance on every install.
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 compliance standards required for professional sound systems where acoustic performance, road reliability, and code adherence are non-negotiable.
More Information
| Condition | Refurbished |
|---|---|
| Country of Manufacture | China |
Reviews
At a Glance
The JBL MTC-300BB8 is a professional-grade backbox enclosure designed to mount flush with suspended ceilings, providing acoustic support for 8-inch JBL Control 300 series drivers in commercial and institutional installations. Built from 16-gauge metal with half-inch MDF lining, it eliminates resonances and extends bass response without consuming excessive ceiling cavity space, making it the standard choice for integrators handling in-ceiling speaker systems. Full U.L. and NFPA certification ensures compliance in air-handling plenums and regulated environments where safety and acoustic integrity are critical.
Who This Is For
Great for
- ✓ Commercial AV Installation
- ✓ Institutional Audio
- ✓ Ceiling-Mounted Speaker Systems
- ✓ Background Music Systems
Not the best pick for
- – Live Performance
- – Portable PA
Skill level: Professional
Frequently Asked Questions
What does B-Stock mean for this backbox?
B-Stock means this unit is fully functional and acoustically identical to new, but may have minor cosmetic imperfections such as dents, scuffs, or finish marks from handling. All performance and compliance certifications remain unchanged.
What is the internal volume and will it work with my 8-inch Control 300 driver?
The internal volume is precisely 0.71 cubic feet, engineered specifically to complement JBL's 8-inch Control 300 series drivers and deliver extended bass response without requiring large ceiling cavity space. This backbox is designed as the acoustic partner for that driver line.
What certifications does this backbox carry?
The MTC-300BB8 is certified under U.L.-2043, U.L.-1480, NFPA90, and NFPA70A, ensuring safe operation in air-handling plenums and other regulated commercial and institutional spaces.
How does it mount in a drop ceiling, and what cable routing options does it offer?
The backbox integrates into standard drop-ceiling grids with a 310 mm (12.2 inch) ceiling cutout and sits 10.2 inches above the ceiling. Five knockout locations—one on top and four on the sides, each 0.87 inches in diameter—provide flexible cable routing for various installation configurations.
Is this suitable for live performance or portable PA systems?
No, the MTC-300BB8 is engineered for fixed commercial, institutional, and ceiling-mounted installations only. It is not designed for live performance or portable PA applications.
Do I pay sales tax on this order?
We collect sales tax only on orders shipped to California. Orders shipped to any other US state are charged $0 sales tax at checkout when you buy direct from our website. Marketplaces such as eBay, Reverb and Amazon collect sales tax in nearly every state as marketplace facilitators no matter who the seller is, so the same item at the same price costs less bought direct. Free US shipping and 30-day returns are included. Some states ask buyers to self-report use tax on out-of-state purchases.
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