Pre-Install In-Ceiling BackCan


JBL's MTC-81BB8 is designed for use in applications requiring preinstalled backcans and is compatible with ceiling speakers having a 286 mm (11.25") mounting circle diameter, such as the JBL 8138 ceiling loudspeaker, and the JBL MTC-81TB8 tile bridge for suspended ceilings.

Providing a larger backcan air volume than most cost-effective backcans, the MTC-81BB8 allows ceiling speakers to produce extra bass capability for a wider frequency response and improved overall sound quality.  This angled-wall backcan nests to reduce inventory space and transportation

The MTC-81BB8 is supplied with five conduit knockouts, four clip-nuts for tile bridge to backcan attachment, as well as acoustic lining and two perforated bend-up mounting straps.


  • Fits 8138 speaker and MTC-81TB8 Tile Bridge
  • Extra-large 7.4 liter (0.26 cu ft) volume allows for extra bass
  • Industry standard 286 mm (11.25" ) mounting circle
  • Five conduit knockouts
  • Nesting during storage minimizes storage space requirements


  • Internal Volume: 7.4 liters (0.26 cu ft)
  • Knockouts:
    - 22 mm (0.87") diameter opening
    - Five (5) locations: 4 on side of can, 1 on top of panel of can
  • Suspension Tabs: 2 flexible perforated mounting straps, one on each side.
  • Attachment Points: 4 clip-nuts on 286 mm (11¼ in) mounting circle fix M4 tapping screws for attaching tile bridge to backcan, plus 4 thru holes providing clearance for screws from speaker to attach to tile bridge.
  • Material: 16 gauge (1.3 mm thick) steel, finished in black powder coating for a high level of rust resistance.
  • Dimensions: 7" H x 11.75" W x 11.75" D (178 x 300 x 300 mm)
  • Net Weight (ea): 2.5 lbs. (1.1 kg)
  • Shipping Weight (ea): 3.2 lbs. (1.5 kg)
  • Associated Models:
    - 8138 200 mm (8") ceiling speaker
    - MTC-81TB8 tile bridge for 600 mm (24") ceiling tile applications.

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