JBL Control24C/CT Micro Ceiling Speakers
Background Music Ceiling Speaker
Extremely wide 150° coverage.
Smooth frequency response.
• 4˝ inch (115 mm) woofer, injection
molded graphite cone with butyl
• ˝ inch (12 mm) polycarbonate
tweeter for extended response.
Control 24C Micro is 8 ohms and
Control 24CT Micro includes 8W multitap
transformer for 70V/100V systems.
Shallow 4-inch (100 mm) depth.
Packaged with grille, backcan and tile
rails for fast installation and easy dealer
The Control 24C Micro and Control
24CT Micro are compact in-ceiling
speakers, providing full, high quality
sound for background music and
These speakers are ideally suited for a wide
variety of applications, from restaurants
and specialty retail stores to
professional offices and airports.
Low distortion and a smooth, natural
frequency response make the Control
24C/CT Micro ideal for medium volume
business music systems as well as for
the medium to low SPL segments of
larger or louder systems.
Low frequency output can be augmented
with the addition of one of the Control
Contractor subwoofer models.
Similar mid/high frequency voicing to other
JBL Control Contractor loudspeakers
can, in many systems, allow for mixing
and matching of models within zones
without requiring separate equalization.
Installation of the Control 24C/CT
Micro is quick and easy.
The loudspeaker is packaged with the backcan,
grille, support backing bracket and tile
In addition, optional new construction brackets are available.
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 mounting tabs which tighten
onto the C-plate, if used, or directly onto the ceiling material.
The Control 24C/CT Micro backcan is made of formed steel and the speaker is
suitable for use in air handling spaces per UL2043.
An attachment loop is provided on the backcan for cabling. A seismic tab is provided as a secondary
The Control 24C/CT Micro trim and baffle are paintable to match any decor.
Frequency Range1: 85 Hz - 25 kHz
Power Capacity2: 30 Watts Continuous Program Power (C24C Micro)
15 Watts Continuous Pink Noise (C24C Micro)
Nominal Sensitivity3: 86 dB SPL @ 1 m (3.3 ft)
Crossover Frequency: 3.5 kHz
Rated Maximum SPL: Control 24C Micro: 98 dB @ 1 m (3.3 ft)
Control 24CT Micro: 94 dB @ 1 m (3.3 ft), 8W tap
Transformer Taps (24CT Micro): 70V: 8W, 4W, 2W, 1W & 0.5 W taps
100V: 8W, 4W, 2W, 1W taps
Low Frequency: 115 mm (4.5 in) IMG (injection molded graphite), 24 mm (1 in)
High-Frequency: 12 mm (0.5 in) polycarbonate
Backcan: Formed steel
Baffle/Rim: Medium impact polystyrene, fire rated UL94V-O
Secondary Attachment Point: Included
Termination: Screw-down terminals, touch-proof, UL, CE and VDE rated,
outside of backcan
Safety Agency Rating: In accordance with IEC60849 / EN60849. Suitable for use in air
handling spaces, per U.L.-2043, U.L.-1480, NFPA90, NFPA70A.
Outside Dimensions (H x Dia): 106 x 195 mm (4.2 x 7.7 in)
105 mm (4.1 in) front of ceiling tile to back of the backcan
Cutout Size: 167 mm (6.6 in)
Net Weight (ea): C: 1.6 kg (3.6 lb) CT: 2.0 kg (4.4 lb)
Shipping Weight (pr): C: 3.6 kg (7.9 lb) CT: 4.4 kg (9.7 lb)
Included Accessories: C-shaped support backing plate
2 tile support rails (fits both 2 ft and 600 mm tiles)
Cutout template, cardboard
Optional Accessories: MTC-24TR trim ring for retrofit installations
MTC-24NC optional new construction bracket, flat
MTC-24MR optional mud ring construction bracket
1Half-space (flush mounted in ceiling)
2Continuous 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.
3Half-space (in ceiling), averaged 100 Hz to 10 kHz.
JBL continually engages in research related to product improvement.
Changes introduced into existing products without notice are an expression of that philosophy.
Control 24C/CT Micro Background Music Ceiling Speakers
-5.3 (133) 4.1 (105)
Frequency Response, on axis in half-space (2, flush
mounted in ceiling) Thru (8 Ů), with Input Impedance
20 100 1000 10000 20000
-6 dB Beamwidth (degrees)
Beamwidth vs. Frequency
Horizontal Off Axis Frequency Response
Vertical Off Axis Frequency Response (up)
Vertical Off Axis Frequency Response (down)
Horizontal 1/3 Octave Polars
The loudspeaker shall be of in-ceiling design, consisting of a 114 mm (4.5 in) low frequency transducer, a 12 mm (0.5 in) tweeter, and frequency
dividing network installed in an integral ported enclosure. The low frequency voice coil shall be 24 mm (1 in) in diameter and the
cone shall be of lightweight injection molded graphite.
Performance specification of a typical production unit
shall be as follows: Measured sensitivity (SPL at 1m [3.3 ft] with 2.83V input, averaged
from 100 Hz to 10 kHz) shall be at least 86 dB-SPL. Usable frequency response shall extend from 85 Hz to 25 kHz (10 dB below rated sensitivity)
with no external equalization. Rated power for 8 ohm unit shall be at least 15 watts continuous pink noise power, defined as conforming
to international standard IEC 268-5 (shaped pink noise with peak-to-average ratio of 6 dB) for a period of 100 continuous hours.
The speaker shall have a nominal conical polar coverage pattern of 150 degrees (at -6 dB point), averaged 500 Hz to 10 kHz, and shall hold
the same consistent polar coverage pattern when averaged in the intelligibility frequency band from 1 kHz to 4 kHz.
The backcan shall be constructed of formed steel and the baffle of UL94V-O fire rated medium impact polystyrene. An agency-rated
enclosed-terminal wiring block shall be provided on the side of the backcan to allow positive screw-down connection of wiring.
The system shall include a support backing plate to reinforce the ceiling material and tile support rails for use on either 2 ft or 600 mm
suspended ceiling tiles, and which can be installed from beneath the ceiling tile.
Overall front face diameter shall not exceed 195 mm (7.7 in) and overall depth from the bottom of the ceiling shall not exceed 105 mm
Control 24C Micro: Nominal impedance shall be 8 ohms. The loudspeaker shall weight no more than 1.6 kg (3.6 lb).
Control 24CT Micro: The loudspeaker shall be equipped with transformer for use in either 70.7V or 100V distributed-line speaker systems,
with taps selectable by connecting the input wire to the selected enclosed wiring block terminal. Taps shall be nominally 8W @ 70V, 4W @
70V (8W @ 100V), 2W @ 70V (4W @ 100V), 1W @ 70V (2W @ 100V) and 0.5W @ 70V (1W @ 100V). The loudspeaker shall weigh no more than 2.0 kg (4.4 lb).
The loudspeaker shall be the JBL Model Control 24C Micro (Control 24CT Micro).