- 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
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.