JBL MTC-29CM-WH Ceiling Mount for Control 29AV Surface Mount Speakers (White)The MTC 29CM WH InvisiBall Assembly is designed for use with the JBL Professional Control 29AV Loudspeaker. The Ceiling Mount allows installation of the enclosure to sturdy ceiling structures by utilizing the internal InvisiBall mechanism. The adapter does not come with a base and requires the use of an existing InvisiBall base, which is included as a standard accessory with the Control 29 speaker. The MTC 29CM is finished in Powder Coating, and can