JBL CBT 70J Constant Bandwitdth
Overview:
The CBT 70J, with Constant Beamwidth Technology™, represents a breakthrough in pattern control consistency, utilizing complex analog delay beam-forming and amplitude tapering to accomplish superior, consistent vertical coverage without the narrow vertical beaming and out-ofcoverage lobing that are typical of straight form-factor column speakers.
The CBT 70J, with Constant Beamwidth Technology™, represents a breakthrough in pattern control consistency, utilizing complex analog delay beam-forming and amplitude tapering to accomplish superior, consistent vertical coverage without the narrow vertical beaming and out-ofcoverage lobing that are typical of straight form-factor column speakers.
The CBT 70J combines Constant Beamwidth Technology with a physical J-shaped curving, resulting in a very well controlled progressive line array with asymmetrical vertical coverage. The asymmetrical coverage produces a higher concentration of sound with a tighter pattern from the upper half of the array and a lower concentration of sound with a broader vertical pattern from the lower half of the array. This sends more sound toward the far area of the room than to the near area of the room, resulting in more even front-to-back SPL levels than would be the case from a traditional speaker or column that projects symmetrically in the vertical plane.
The two-way coaxial design provides a wide 60 Hz – 20 kHz bandwidth. The low-diffraction baffle eliminates frequency response irregularities that could otherwise occur due to baffle discontinuities. The slim, compact design fits well into virtually any architectural decor. The 70 cm (27.6 in) tall line array height provides consistent pattern control throughout the intelligibility band, making the CBT 70J work well in difficult acoustic environments.
Key Features:
- Asymmetrical vertical coverage sends more sound toward far area of room to
- make front-to-back sound levels more consistent.
- Components: Sixteen 25 mm (1 in) soft dome tweeters and four 125 mm (5 in)
- high-power LF drivers, arranged coaxially.
- Patent-pending Constant Beamwidth Technology™ provides constant directivity
- up to the highest frequencies and reduces out-of-coverage lobing.
- Vertical pattern coverage switchable between 45° for medium-throw coverage
- and 25° for long-throw applications.
- Switchable voicing provides flat response in music mode or mid-range presence
- peak in speech mode.
- Dynamic SonicGuard™ overload protection of HF devices
- Wall bracket included.
Application
The combination of superior sound quality, excellent pattern control, asymmetrical vertical coverage and compact design makes CBT 70J extremely versatile.
It is ideal for applications such as performance auditoriums, lecture halls, classrooms,A/V, transit centers, school stadiums, multipurpose spaces, racetracks, theme parks, and fill applications, among many others.
Adjustable Coverage to Fit the Application
The innovative coverage adjustability allows switching between broad and narrow vertical coverage settings to allow matching the coverage and throw requirements of the application. Coverage can be easily switched in-venue with the speaker already installed.
This innovation allows a single loudspeaker model to excel in an extremely wide variety of project types.
User Variable Voicing
The voicing can be set to match the application through a Music/Speech switch. The Music setting provides flat frequency response, while the Speech setting produces a midrange presence boost to provide clear, intelligible speech even at the longest throw distances, along with increased midrange sensitivity for higher midrange maximum output capability.
Drivers
The low frequency drivers are lightweight dual magnet neodymium motors with 38 mm (1.5 in) diameter voice coils. The dual magnet system provides maximum flux in a compact package. The magnet structure is magnetically shielded and the pole tips are magnetically saturated for lower flux modulation and minimum distortion. The 16 mm (0.63 in) long coil provides high linear drive and high power handling in a compact driver. The
LF drivers feature damped blended textile surrounds and coated sealed paper
cones found in high performance large format drivers.
The high frequency driver features a dual magnet neodymium structure for maximum sensitivity. The tweeter is encased for weather resistance. The drivers are magnetically shielded to allow close placement CRT monitors.
Both drivers feature coated diaphragm materials to provide moisture, UV and salt resistance for outdoor capability.
SonicGuard™
Dynamic SonicGuard™ protection on the high frequency section minimizes distortion at high drive levels by limiting driver excursion dynamically. This maximizes music clarity and speech intelligibility at high drive levels while protecting the drivers from damage due to occasional overpowering.
Bracketry
A wall-mount tilt bracket is included, plus ten M6 inserts on the back panel fit the spacing of common third-party mounting brackets, or can be utilized to suspend the speaker using forged shoulder steel eyebolts or swivel mounting rings, providing installation versatility.
CBT 70J can be installed either indoors or outdoors. The drivers are weather-treated, the fiberglass reinforced ABS cabinet is excellent for outdoor applications, external screws are stainless steel and the painted aluminum grille resists rusting in the harshest conditions. Available in black or white (-WH).
Specifications:
