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Control
Professional Series
Key Features:
䉴 Coaxially mounted 100 mm (4 in) woofer
with butyl rubber surround and 19 mm
(¾ in) titanium coated diffraction-loaded
tweeter
䉴 High power, wide frequency response and
low distortion for high sound level
capability
䉴 Wide coverage allows fewer speakers,
reducing the cost of the installed sound
system without sacrificing performance
䉴 Packaged with grille, backcan and tile rails
for fast installation and easy dealer stocking
䉴 Black baffle and grille works well in black
and dark ceiling
The Control 24CT-BK is a compact ceiling
speaker providing premium performance in
background, foreground and music-pluspaging sound systems. The Control 24CT-BK
is perfectly suited for a wide variety of
applications from professional offices and
airports to restaurants and specialty retail
stores. High power handling, wide frequency
response and low distortion make the
Control 24CT-BK ideal for sound systems
requiring a higher fidelity sound from ceiling
loudspeakers. The premium performance
capability ensures excellent sound character,
providing pleasant, enveloping sound
throughout the listening area.
The Control 24CT-BK includes a multitap
transformer for 70V/100V systems.
The computer-optimized ported enclosure
delivers warm, smooth bass response. Low
frequency output can be further augmented
with the addition of one of the Control
Contractor subwoofer models.
The 100 mm (4 in) woofer features a
polypropylene-coated cone and pure butylrubber surround for long life, even in high
humidity environments. An aluminum voice
coil former provides extra cooling for greater
long-term power handling.
The coaxially mounted 19 mm (¾ in)
titanium coated tweeter provides crisp, clear
highs. Diffraction-loading of the tweeter
provides wide, even coverage of the listening
area. The extremely broad 130° coverage
pattern allows for fewer speakers to be used,
making for a simpler and less expensive
installation.
®
Background/
Foreground
24CT-BK
Ceiling Speaker
Specifications:
System:
Transducers:
Physical:
Outside Dimensions (H x Dia): 200 x 195 mm (7.9 x 7.7 in)
1
Half-space (flush mounted in ceiling)
2
Continuous Pink Noise rating is IEC-shaped pink noise with a 6 dB crest factor for 100 hours continuously.
Continuous Program power is a conservative expression of the system’s ability to handle normal speech and music
program material and is defined as 3 dB above the Continuous Pink Noise Rating.
3
Half-space (in ceiling), average 100 Hz to 10 kHz
4
500 Hz to 4 kHz
JBL continually engages in research related to product improvement. Changes introduced into existing products
without notice are an expression of that philosophy.
Freq. Range (-10 dB)1: 80 Hz - 20 kHz
Power Capacity2: 80 Watts Continuous Program Power
Nominal Sensitivity3: 86 dB SPL @ 1 m (3.3 ft)
Nominal Coverage Angle4: 130° conical coverage
Directivity Factor (Q): 2.4 averaged 500 Hz to 4 kHz
Directivity Index (DI): 3.8 averaged 500 Hz to 4 kHz
Rated Maximum SPL: 102 dB @ 1 m (3.3 ft)
Transformer Insertion Loss: Max 0.8 dB
Transformer Taps: 070V: 30W, 15W, 7.5W & 3.7W taps
Low-Frequency: 100 mm (4.0 in) Polypropylene-coated,
High-Frequency: 19 mm (0.75 in) Titanium coated polyester
Enclosur
Termination: Removable locking connector with screw-down
Safety Agency Rating:
Cutout Size: 168 mm (6.6 in)
Net Weight (ea): 3.5 kg (8 lb)
Shipping Weight (pair): 8.0 kg (18 lb)
Included Accessories: C-shaped support backing plate
40 Watts Continuous Pink Noise
100V: 30W, 15W, & 7.5W taps
1" coil on aluminum former
e: Backcan: Formed steel
Baffle/Rim: Medium impact polystyrene, fire rated
UL94V-0
terminals. 2 input terminals and 2 loop-thru output
terminals. Max. wire size 12 AWG (2.5 mm2)
In accordance with IEC60849 / EN60849. Suitable for use
in air handling spaces, per U.L.-2043, U.L.-1480, NFPA90,
NFPA70A. Baffle UL-94V0 rated. Transformer UL813
registered.
184 mm (7.2 in) front of ceiling tile to back of
backcan
2 tile support rails (fits both 2 x 4 ft or
Cutout template
Paint shield
Removable locking wiring connector
600 x 1200 mm tiles)
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䉴 Control®24CT-BK Background/Foreground Ceiling Speaker
Input connection is conveniently provided on a removable
locking connector (included), providing secure connection via
screwdown terminals and allowing a system to be prewired before
installing the speaker for fast snap-on convenience. Separate
connector terminals are available for the input and for the loopthrough wires, making it easy to jumper the speaker signal to
additional speakers. The input terminal plate provides strain relief
for either bare wire, plenum cable or ½ inch conduit (12 mm I.D.).
The terminal box is securely enclosed to meet safety codes.
The speaker trim and grille are paintable to match any decor. A
paint shield is provided for covering the drivers while painting the
rim.
Installation of the Control 24CT-BK is quick and easy. The
loudspeaker is packaged complete with the backcan, grille, support
backing bracket and tile rails.
The entire installation can be accomplished without requiring
access above the ceiling. A template is provided for marking the
cutout. An innovative C-shaped support backing plate can be
installed from below through the cutout to reinforce the top of the
ceiling material. Tile bridge rails are included which can be
screwed onto the C-plate to extend support to the T-channel grid
in suspended ceiling installations. After the speaker is fitted through
the cutout, it is held securely in place via three mounting tabs
which tighten onto the C-plate, if used, or directly onto the ceiling
material.
The Control 24CT-BK backcan is made of formed steel and the
speaker is suitable for use in air handling spaces, per U.L.-2043. An
attachment loop is provided on the backcan for cabling to the
building structure as a secondary support in seismic areas or where
required by code.
The 30W multitap transformer is for use in either 70.7V or 100V
distributed-line systems. Taps are selected with a rotary switch
conveniently located on the front panel, but protected under the
grille, so that the speaker does not have to be removed to adjust
tap settings.
All JBL Control Contractor loudspeakers - both ceiling speakers
and surface-mount models - are designed with a similar sonic
signature, allowing for mixing and matching of the various models
within an application, providing a similar tonal character
throughout the entire listening area.
Frequency response is measured on-axis with at a distance
referenced to 1 meter at 1-watt.Shown as a half-space (2)
environment. (x-former bypassed)
Off Axis Frequency Response (1/3 Oct Avg)
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1/3 Octave Polars
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䉴 Control®24CT-BK Background/Foreground Ceiling Speaker
Architectural Specifications:
The loudspeaker shall be of in-ceiling design, consisting of a 100 mm (4 in) low frequency transducer, a coaxially-mounted 19 mm (¾ in) high frequency transducer, and
frequency dividing network installed in a ported enclosure. The low frequency voice coil shall be 25 mm (1 in) in diameter and the coil former shall be of aluminum for
maximum heat dissipation.
Performance specifications of a typical production unit shall be as follows: Measured sensitivity (SPL at 1m [3.3ft] with 4V input, averaged from 100 Hz to 10 kHz bypassing
the transformer) shall be at least 86 dB-SPL. Usable frequency response shall extend from 80 Hz to 20 kHz (10 dB below rated sensitivity in half-space) with no external
equalization.
The high frequency transducer shall be horn-loaded to more evenly cover a minimum 130° polar conical coverage area.
The backcan shall be constructed of formed steel and the baffle of UL94V-0 fire rated medium impact polystyrene. An enclosed terminal box shall be included proving
strain relief for use with either plenum-rated wire, ½ in (13 mm inside diameter) conduit, or flexible conduit up to 22 mm (⅞ in) outside diameter. The external wiring shall
be accomplished via a removable lockable wiring connector with screw-down terminals to provide both secure wire termination and prewiring capability before loudspeaker
installation. An attachment loop shall be provided on the back panel for cabling to building structure as a secondary support point.
The system shall include a support backing plate to reinforce the ceiling material and tile support rails for use on either 2 x 4 ft or 600 x 1200 mm suspended ceiling tiles
and which can all be installed from beneath the ceiling tile.
Overall front face diameter shall not exceed 195 mm (7.7 in), overall depth from the bottom of the ceiling shall not exceed 183 mm (7.2 in), and shall weigh no more than
2.7 kg (6 lb).
The loudspeaker shall be equipped with transformer for use in either 70.7 or
100V distributed-line speaker systems, with taps selectable by rotary switch located
on the front panel so that the speaker does not have to be removed to adjust tap
settings. Taps shall be nominally 30W @ 70V, 15W@ 70V (30W @ 100V), 7.5W
@70V (15W @ 100V), and 3.7W @ 70V (7.5W @ 100V).
The loudspeaker shall be the JBL Model Control 24CT-BK.
195
(7.7)
163
(6.4)
163
(6.4)
183
(7.2)
Dimensions in mm (in)
JBL Professional
8500 Balboa Boulevard, P.O. Box 2200
Northridge, California 91329 U.S.A.
A Harman International Company
© Copyright 2009 JBL Professional
www.jblpro.com
200
(7.9)
SSControl 24CT-BK
CRP
1/09
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