Line Array Column Loudspeakers Featuring JBL’s
Patent-Pending Constant Beamwidth Technology
CBT 50LA
Compact Speech & Music
CBT 100LA
Pattern Control Speech & Music
CBT 70J
Full-Range J-Shaped
CBT 70JE
LF & Pattern Extension
The JBL CBT Series with Constant Beamwidth Technology
Ushering in a new era for passive column speaker technology based on years of extensive research conducted by Harman engineers, the JBL CBT Series line array columns with Constant Beamwidth Technology break new ground in performance, versatility, and affordability. Designed for venues that would typically use larger point-and-shoot speakers, the CBT models incorporate technical advancements that allow them to vastly outperform competitive systems, with a level of userfriendliness that virtually eliminates the challenges of delivering great sound.
Constant Beamwidth Technology
At the core of the CBT Series is a forward thinking conceptual design that shatters the notion of passive column speakers as performance-limited solutions to sound reinforcement. The CBT Series raises the bar far beyond the competition with patent pending technology that draws upon and adds to the long history of JBL innovation, delivering new capabilities, many of which are firsts in the industry.
The Challenge With traditional passive |
columns, |
the |
coverage |
continually |
narrows at higher frequencies, resulting in |
much of |
the |
listening |
area being |
covered by only part of the sound spectrum. Driver interactions cause the frequency response to change at every point off - axis and at every distance away from the speaker. Each listener hears a different balance of sound. In addition, lobes of sound projecting outside the listening area increase the reverberation, reducing intelligibility and interfering with musical quality. 
Traditional passive column soundfield |
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Frequency Response with Distance |
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10 |
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10 |
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5m |
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-10 |
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10m |
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-20 |
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20m |
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Straight line array 1m off centerline |
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2 kHz shown, every frequency differs |
-30 |
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100 |
10000 |
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The Solution Constant Beamwidth Technology solves these problems by locking in and maintaining a specific coverage over a very wide bandwidth. The CBT models deliver smooth, consistent coverage that is similar to complex and far more expensive line arrays. The CBT Series’ constant directivity coverage delivers consistent frequency response at every distance as well as off-axis. With the CBT Series, every seat in the house experiences the same quality of sound regardless of position. 
JBL CBT column soundfield |
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Frequency Response with Distance |
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10 |
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10 |
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5m |
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-10 |
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10m |
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-20 |
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20m |
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CBT 1m off centerline |
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2 kHz shown, other frequencies identical |
-30 |
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100 |
10000 |
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