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JBL MTC-81BB8 Pre-Install In-Ceiling Backcan for 8138 Speaker, 4 Pack

The JBL MTC-81BB8 is designed for use in applications requiring preinstalled backcans and is compatible with ceiling speakers having a 286 mm (11-1/4") 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. 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.