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JBL Professional MTC-81BB8 Pre-Install in-Ceiling Backcan, 11.25-Inch Mounting Circle, Sold as a Pack of 4The JBL Professional 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 JB..