MBX Metal Back Box



Metal Back Box

MBX back boxes can be used in walls or ceilings where a UL rated metal enclosure is required behind the speaker or to reduce sound transfer to adjacent spaces.  At 3-1/2” (89 mm) deep, the MBX series of back boxes will fit into standard 2×4 stud bays or larger apertures and are designed to fit in between 16” (406 mm) on-center studs.  We recommend using the MBX-30 for LR3 and B30 panels and the MBX-22 for all other Stealth Acoustic speaker panels.

MBX metal back boxes are constructed of 1.1 mm thick metal, are UL listed, and shipped fully assembled.  Convenient knockouts for conduit are provided, 2 each on the top and bottom of the box.  The knockouts will accept either 1/2” (13 mm) or 3/4” (19 mm) conduits and loom clamps.



Screw package and foam pads (Included)
Metal Stud C-Channel Blocking Kit (Optional)
3/4” (19 mm) x 1-1/2” (38 mm) metal mounting angles.


Specification Sheet: Download PDF


Model For Speakers Width Height Depth Ship Weight
MBX-30 LR3gB30g 14-1/2″(368 mm) 28-1/2″(722 mm) 3-1/2”(89 mm) 13 lbs.(5.9 kg)
MBX-22 LRX83LR8gB22gSLR8gLR4G-LF 14-1/2″(368 mm) 20-1/2”(519 mm) 3-1/2”(89 mm) 10 lbs.(4.5 kg)
MBX-12 LR6GLR4G-HM 14-1/2″(368 mm) 10-3/8″(262 mm) 3-1/2″(89 mm) 8 lbs.(3.6 kg)



MBX Back Box installation diagram