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The MTC-81BB8 from JBL is a pre-install in-ceiling backcan designed for 11.25" ceiling speakers, such as the 8138. It has an industry-standard mounting circle, and an extra-large volume to provide extra bass response. It has 5 conduit knockouts for running cables, and has the ability to nest during storage to minimize space requirements.
Designed to fit the 8138 in-ceiling speaker and the MTC-81TB8 tile bridge
Industry-standard 11.25" mounting circle
Extra-large volume provides extra bass response
5 conduit knockouts for easy cable installation
Nesting capability reduces the amount of space needed for storage
In the Box
JBL MTC-81BB8 Pre-Install Backcan for 8138 Speaker