JBL MTC-300BB8 Backbox For 8" Control 300 Series Drivers B-Stock
Description
JBL MTC-300BB8 Backbox For 8" Control 300 Series Drivers
The MTC-300BB8 is a professional-grade enclosure designed to mount flush with suspended ceilings, providing the acoustic foundation needed for in-ceiling speaker installations in commercial and institutional environments. Its compact footprint and robust construction make it the go-to choice for integrators working with JBL's 8-inch Control 300 drivers.
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 without requiring excessive ceiling cavity space.
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. Full certification under U.L.-2043, U.L.-1480, NFPA90, and NFPA70A ensures safe operation in air-handling plenums and other regulated 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 compliance standards required for professional installations where acoustic performance and code adherence are non-negotiable.
More Information
| Condition | Refurbished |
|---|
Reviews
At a Glance
The JBL MTC-300BB8 is a professional ceiling-mount backbox engineered to pair with 8-inch JBL Control 300 drivers, delivering resonance-free, extended bass response from a compact 0.71 cubic foot internal volume. Its robust 16-gauge metal and half-inch MDF construction provide acoustic precision and vibration control, making it ideal for studio reference installations or fixed-installation monitoring where neutral, consistent frequency response matters. Multiple knockouts and compliance certifications make it flexible for any wiring configuration in professional studio environments.
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.
Similar Gear
Complete the Rig
Gear that pairs well with this.
✨ For You
Based on what you've been looking at.