Description
The JBL MTC-300BB12 Three-Cubic-Foot Backbox features extra-thick 16-gauge metal construction and a thick resonance-eliminating lining that also provides extra bass response. Made for the Control 300 Series 12" Drivers, this backbox has a dual-mounting system for baffle and knockouts on all four sides.
Product Specifications:
External Volume: 3 cu ft, nominal
Internal Volume: 2.4 cu ft.
Knockouts: 22.1 mm (0.87 in) diameter openingFive (5) locations
Height: 308 mm (12.1 in) above ceiling324 mm (12.6 in) total height
Width: 587 mm (23.1 in)
Depth: 461 mm (18.2 in) cabinet505 mm (19.9 in) including side tabs
Ceiling Cutout Size: 378 x 378 mm (14.9 x 14.9 in)
Weight: 23.1 kg (51 lbs)
Financing Options
Hassle-Free Financing Available
Get the gear you need now and pay over time. Perfect for working DJs, artists, and sound pros who need pro-grade speakers, lighting, and cases to stay competitive.
- Shop Pay & Afterpay for instant financing right at checkout
- Acima, Synchrony, Progressive & Snap lease-to-own and financing options
- Fast approvals so you buy today and pay monthly
Military & First Responder Discounts
We're proud to support those who serve. Active-duty military, veterans, and first responders qualify for a special discount on your gear. See our Military Discount details here and how to redeem.

