|JBL Professional Breaks New Ground With CBT Series Line Array Columns
Constant Beamwidth Technology™ CBT Series resets the standards for directivity and versatility
in passive column loudspeakers.
AMSTERDAM, The Netherlands – Offering unprecedented levels of directivity control, sonic fidelity and
affordability, JBL Professional today introduced the CBT Series of passive line array columns, featuring JBL’s
patent-pending Constant Beamwidth Technology™ circuitry, a breakthrough in pattern control that provides
remarkably consistent constant directivity coverage and superb audio clarity, even in difficult acoustical
“With the CBT Series, JBL is improving upon a number of challenges customers have typically faced with
traditional passive columns, which causes the listening area to be covered inconsistently and every listener
hearing a different sound character, including inconsistent coverage angles at every frequency, frequency
response that changes considerably with distance, and out-of-coverage lobes that contribute to a destructive
reverberant field,” said Rick Kamlet, Senior Director, Commercial Installed Sound, JBL Professional. “All these
factors result in the listening area being covered inconsistently and every listener hearing a different sound
character. After years of research by JBL engineers, the CBT Series, with Constant Beamwidth Technology,
represents a new benchmark in performance and versatility for passive column loudspeakers, providing not
only constant directivity, but also adjustable coverage control, full-fidelity sound quality, and one model that
provides a very versatile asymmetrical pattern for more consistent front-to-back sound levels within the room
while reducing reflections from the back wall. These features, along with high output levels, make the CBT
Series a great choice not just for traditional column applications, but also for projects where larger point-andshoot
speakers would normally be utilized.”
The coverage pattern of the CBT models can be adjusted—with a simple
switch—between Broad Mode (designed for mid-throw situations) and
Narrow Mode (for long-throw applications). This versatility allows the CBT’s
to meet the requirements of a broad range of applications. In addition, the
CBT speakers provide Dynamic SonicGuard overload protection circuitry,
which reduces distortion at high drive levels, along with user variable voicing
which allows selecting a flat frequency response or a midrange presence
peak for especially clear speech intelligibility.
The CBT 50LA is a very compact 50 cm high column that utilizes a straight
line of eight 2-inch drivers, while the taller CBT 100 LA is a straight 100 cm
high column utilizing 16 2” drivers and handles 325 Watts continuous pink
noise for high output levels. Combined with Constant Beamwidth
Technology circuitry, both provide constant directivity coverage. Both also
contain low-saturation transformers, so they can be used on 70V/100V
distributed speaker lines or as low impedance speakers.
The J-shaped CBT 70J is a 2-way coaxial line array utilizing 16 soft dome
tweeters and four high power 5-inch woofers at a 70 cm height. The Jshape
of the array works in conjunction with the Constant Beamwidth
Technology circuitry to provide asymmetrical coverage similar to that of
expensive line arrays commonly used in concert systems. The column’s top
half projects highly concentrated sound toward the back of the venue, while
the bottom half down-fills a broader, less concentrated sound to the front of the venue, resulting in more
consistent sound levels from front to back.
This 500W system contains a pattern control switch for either 45 or 25 degrees vertical coverage.
The CBT 70JE is an extension cabinet for the 70J, further extending the pattern control of the CBT 70J by
doubling its height, which lowers the frequency to which the speaker holds a consistent pattern of coverage,
and doubling the power handling. The 70JE also increases the bass capability and extends the low-frequency
response of the system to 1000 Watts continuous pink noise. The selectable vertical coverage, music/speech
settings, the option to add an extension for bass and pattern control, asymmetrical vertical coverage, high
output, and wide bandwidth makes the CBT70J an extremely versatile loudspeaker that fits into a wide variety
Despite the advanced features and performance built into the CBT Series, they are extremely easy to use,
encompassing a new level of user-friendliness that makes them very straightforward to design into everyday
projects. The CBT models can be installed either indoors or outdoors and the thin and sleek design is so
unobtrusive that they almost vanish into the décor.
The wide variety of applications for the CBT Series include performance spaces, transit centers, lecture halls,
multi-purpose rooms, board/meeting rooms, retail stores, courtrooms, theme parks, houses of worship,
fellowship halls, movie theater lobbies, cinema surround, audio supporting video, race tracks, and many others.
JBL is a unit of Harman International Industries, Incorporated (www.harman.com). Harman International Industries, Incorporated designs, manufactures and markets a wide range of audio and infotainment products for the automotive, consumer and professional markets. Harman International maintains a strong presence in the Americas, Europe and Asia, and employs more than 11,000 people worldwide. The Harman International family of brands includes AKG®, Audioaccess®, Becker®, BSS®, Crown®, dbx®, DigiTech®, Harman Kardon®, Infinity®, JBL®, Lexicon®, Mark Levinson®, Revel®, QNX®, Soundcraft® and Studer®. Harman International's stock is traded on the New York Stock Exchange under the symbol "NYSE: HAR."