Pre-Install In-Ceiling Backcan

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Pre-Install In-Ceiling Backcan

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


  • 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 in) mounting circle
  • Five conduit knockouts
  • Nesting during storage minimizes storage space requirements


  Version Language Size Uploaded
file type icon MTC-81BB8 Spec Sheet
updated: Okt 2020
    176 KB Okt 2020
file type icon 8138 Frequently Asked Questions
updated: Okt 2020
    31,5 KB Okt 2020
file type icon MTC-81BB8 Hi Res Image
updated: Okt 2020
    9,15 MB Okt 2020

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Parts & Service


Internal Volume 7.4 liters (0.26 cu ft)
Knockouts 22 mm (0.87 in) diameter opening
Five (5) locations 4 on side of can1 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 (11.25 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 (see assembly drawing).
Material 16 gauge (1.3 mm thick) steel, finished in black polymer E-coating for a high level of rust resistance.
Dimensions (H x W x D) 178 mm (7 in) height x 300 mm (11.75 in) width and depth
Net Weight (each) 1.1 kg (2.5 lbs)
Shipping Weight (ea) 1.5 kg (3.2 lbs)
Associated Models 8138 200 mm (8 in) ceiling speakerMTC-81TB8 tile bridge for 600 mm (24 in) ceiling tile applications.


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Pre-Install In-Ceiling Backcan