Purpose-Designed Extension For Cbt 70J-1 Line Array Column Speaker. With Stronger Grille - SingleWhen Connected To A Cbt 70J-1 Line Array Column Speaker The Cbt 70Je-1 Extension Provides Extended Bass Response Extended Pattern Control And Increased Sound Output Levels. The Combined Array System Provides Constant Beamwidth Technology™ Which Represents A Breakthrough In Pattern Control Consistency Utilizing Complex Analog Beamforming And Amplitude Tapering To Accomplish Superior Consistent Vertical Coverage Without The Narrow Vertical Beaming And Out-Of-Coverage Lobing That Are Typical Of Passive Column Speakers.FeaturesSingle/ PairSingle