2Wirer 24C User Manual

Background  
Music  
Control24C/CT Micro Ceiling Speaker  
Professional Series  
Key Features:  
Extremely wide 150° coverage.  
Smooth frequency response.  
Components:  
• 4½ inch (115 mm) woofer, injection  
molded graphite cone with butyl  
rubber surround.  
½ inch (12 mm) polycarbonate  
tweeter for extended response.  
Control 24C Micro is 8 ohms and  
handles 15W.  
Control 24CT Micro includes 8W multi-  
tap transformer for 70V/100V systems.  
Shallow 4-inch (100 mm) depth.  
Packaged with grille, backcan and tile  
rails for fast installation and easy dealer  
stocking.  
through the cutout, it is held securely in place via mounting taps 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  
support.  
Applications  
The Control 24C Micro and Control  
24CT Micro are compact in-ceiling  
speakers, providing full, high quality  
sound for background music and  
music-plus-paging systems. These  
speakers are ideally suited for a wide  
variety of applications, from restaurants  
and specialty retail stores to  
The Control 24C/CT Micro trim and baffle are paintable to match any decor.  
Specifications:  
System:  
1
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.  
Frequency Range : 85 Hz - 25 kHz  
2
Power Capacity : 30 Watts Continuous Program Power (C24C Micro)  
15 Watts Continuous Pink Noise (C24C Micro)  
3
Nominal Sensitivity : 86 dB SPL @ 1 m (3.3 ft)  
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  
Transducers:  
Low Frequency: 115 mm (4.5 in) IMG (injection molded graphite), 24 mm (1 in)  
voicecoil  
High-Frequency: 12 mm (0.5 in) polycarbonate  
Physical:  
Enclosure Material: 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: Suitable for use in air handling spaces, per UL2043, UL1480,  
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  
Installation of the Control 24C/CT  
Micro is quick and easy. The loud-  
speaker is packaged with the backcan,  
grille, support backing bracket and tile  
rails. In addition, optional new  
construction brackets are available.  
The entire installation can be  
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 x 4 ft and 600 x 1200 mm tiles)  
Cutout template  
accomplished without requiring access  
above the ceiling. A template is  
Optional Accessories: MTC-24TR trim ring for retrofit installations  
MTC-24NC optional new construction bracket, flat  
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  
MTC-24MR optional mud ring construction bracket  
1
Half-space (flush mounted in ceiling)  
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.  
Half-space (in ceiling), averaged 100 Hz to 10 kHz.  
2
3
JBL continually engages in research related to product improvement. Changes introduced into existing products with-  
out notice are an expression of that philosophy.  
 
Horizontal 1/3 Octave Polars  
Architectural Specifications:  
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 fre-  
quency 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 sensi-  
tivity) with no external equalization. Rated power for 8 ohm unit shall be at least 15 watts continuous pink noise power, defined as conform-  
ing 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 x 4 ft or 600 x  
1200 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  
(4.1 in).  
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).  
 
Control 24C/CT Micro Background Music Ceiling Speakers  
Vertical 1/3 Octave Polars  
JBL Professional  
8500 Balboa Boulevard, P.O. Box 2200  
Northridge, California 91329 U.S.A.  
SS Control 24C/CT  
CRP 10M  
4/01  
A Harman International Company  
© Copyright 2001 JBL Professional  
 

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