MBA Metal Back Box – Adjustable



Adjustable metal back box

The versatile, UL listed MBA back boxes are built to adapt to whatever framing configuration you may have on the job site.  MBA back boxes are recommended for installations:

1. Where the space behind the speaker is open;
2. Where a metal closure is required and the mounting distance between the framing members is less than 16” (406 mm) on center;
3. When using metal studs or hat channel/suspended hard lid ceilings.

MBA series back boxes are constructed of 1.1 mm thick metal and are shipped unassembled, ready for your custom configuration needs and UL listed. Convenient 1/2” (13 mm) and 3/4” (19 mm)knockouts for conduit are provided.


Included Accessories:

Screw package and foam pads
Dynamat adhesive box insulation
3/4” (19 mm) x 1-1/2” (38 mm) metal mounting angles.



LineaResponse Brochure: Download PDF

Specification Sheet: Download PDF

Application Detail: Download PDF


Model For Speakers Width Height Depth Ship Weight
MBA-30 LR3B30 9-3/4″ to 14-1/2″
(247 – 368 mm)
30” (762 mm) 3-1/2” (89 mm) 13 lbs.(5.9 kg)
MBA-22 LRX83LR6LR8B22SLR8LR4-B22LR4-HM 9-3/4″ to 14-1/2″
(247-368 mm)
22” (559 mm) 3-1/2” (89 mm) 10 lbs.(4.5 kg)


installation diagram