JBL CBT70J-1 User Manual

CBT 70J-1

Key Features:

Asymmetrical vertical coverage sends more
sound toward far area of room to make front-to­back 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-of­coverage 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

Swivel (pan) / tilt wall bracket included.

Overview:

The CBT 70J-1, 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-of-coverage lobing that are
typical of straight form-factor column speakers.

The CBT 70J-1 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 thick, heavy-duty aluminum
grille stands up to portable/event applications
while allowing for rust-free installation outdoors.

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-1 work well in difficult
acoustic environments.

Applications

The combination of superior sound quality,
excellent pattern control, asymmetrical vertical
coverage and compact design makes CBT 70J-1
extremely versatile. It is ideal for applications
such as performance auditoriums, lecture halls,
classrooms, A/V, transit centers, school stadiums,

Constant Beamwidth Technology™
Two-Way Line Array Column with
Asymmetrical Vertical Coverage

Shown with included grille. Grille removed.

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 mid-range 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 swivel (pan) / tilt wall-mount 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-1 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).

CBT 70J-1 Two-Way Line Array Column with Asymmetrical Vertical Coverage

Specifications:

System:

Components: Four 130 mm (5 in) LF drivers

Sixteen 25 mm (1 in) HF drivers

Frequency Range (-10 dB)1: 60 Hz – 20 kHz

Coverage: Vertical (selectable via switch)

Sensitivity (2.83V@ 1m)

Nominal Impedance: 8 ohms

Power Capacity

Max SPL

Transducers:

Low Frequency Drivers: 4 pcs, 130 mm (5 in) drivers, dual magnet neodymium, 38 mm

High Frequency Drivers: 16 pcs, 25 mm (1 in) drivers, dual magnet neodymium,

Enclosure:

Enclosure: Fiberglass reinforced ABS cabinet, painted aluminum grille

Outdoor Capability: IP-54 rated, per IEC529. UV, moisture and salt-spray resistant.

Colors: Black or white (-WH)

Insert Points: 10 M6 swivel (pan)/tilt (16 mm deep) insert points on back panel.

Mounting: Included swivel (pan)/tilt wall bracket provides continuously

Dimensions (H x W x D): 694 x 170 x 237 mm

Net Weight: 9.5 kg (21 lb)
Included Accessories: Swivel (pan) / tilt wall bracket
Optional Accessories: MTC-PC2 terminal panel cover

1

Full space

2

IEC standard, full bandwidth pink noise with 6 dB crest factor.

3

Calculated based on power rating and measured sensitivity, exclusive of power compression.

JBL continually engages in research related to product improvement.
Changes introduced into existing products without notice are an expression of that philosophy.

Narrow Mode: 25° (2 kHz - 16 kHz) (±10°)
Broad Mode: 45° (750 Hz - 16 kHz) (±10°)

Horizontal 150° (500 Hz – 8 kHz, ±20°)

1

: Narrow: (speech mode) 98 dB (1 kHz - 8 kHz)

(music mode) 93 dB (300 Hz - 18 kHz)

Broad: (speech mode) 96 dB (1 kHz - 8 kHz)

(music mode) 92 dB (300 Hz - 18 kHz)

2

: 500 W (2000 W peak), 2 hrs

350 W (1400 W peak), 100 hrs

3

: Narrow: (speech mode) 125 dB cont ave (131 peak)

(music mode) 120 dB cont ave (126 peak)

Broad: (speech mode) 123 dB cont ave (129 peak)

(music mode) 119 dB cont ave (125 peak)

(1.5 in) voice coil, damped blended textile surround, coated
diaphragm for moisture, UV, and salt resistance, shielded.

encased magnet and coated diaphragm for moisture, UV and
salt resistance, shielded.

variable +/-80 degree left-right swivel aiming (at no up/down
tilt -- see Bracket Guide for maximum swivel range at various
up/down tilt angles), continuously variable +/-15 degree tilt, as
well as 5 degree fixed increment points. Ten threaded
mounting points located on back panel of cabinet conform
to industry standard rectangular 127 x 70 mm (5.0 x 2.75 in)
pattern for OmniMount® 60.0 and other compatible
third-party brackets. Threaded mounting points can
be utilized for suspension.

(27.4 x 6.7 x 9.3 in)

MTC-CBT-SMB1 Stand-Mount Bracket for use with 35 mm heavy
duty speaker stand
MTC-CBT-FM2 flush-mount low-profile wall-mount bracket