Specification Sheet

ManualsBrandsJBL Professional ManualsCeiling & In-Wall Speakers4-Inch Background/Foreground Ceiling Loudspeaker, Black, Sold as Pair

Control

24CT-BK

Professional Series – Background/Foreground Ceiling Speaker

SPECSHEET

Description:

The Control 24CT-BK is a compact ceiling speaker

providing premium performance in background,

foreground and music-plus-paging 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 butyl rubber 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.

Key Features:

• Coaxially mounted 100 mm (4 in) woofer with butyl rubber surround and 19 mm (¾ in)

titanium coated diffraction-loaded tweeter

• High power, wide frequency response and low distortion for high sound level capability

• Wide coverage allows fewer speakers, reducing the cost of the installed sound system

without sacriﬁcing performance

• Packaged with grille, backcan and tile rails for fast installation and easy dealer stocking

• Black bafﬂe and grille works well in black and dark ceiling

Speciﬁcations:

System

Frequency Range (-10 dB)

80 Hz – 20 kHz

Power Capacity

80 Watts Continuous Program Power

40 Watts Continuous Pink Noise

Nominal Sensitivity

86 dB SPL @ 1 m (3.3 ft)

Nominal Coverage Angle

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 70V: 30W, 15W, 7.5W & 3.7W taps

100V: 30W, 15W, & 7.5W taps

Transducers

Low Frequency 100 mm (4.0 in) Polypropylene-coated, 1” coil on aluminum former

High Frequency 19 mm (0.75 in) Titanium-coated polyester

Physical

Enclosure Backcan: Formed steel

Bafﬂe/Rim: Medium impact polystyrene, ﬁre rated UL94V-0

Termination Removable locking connector with screw-down terminals. 2 input

terminals and 2 loop-thru output terminals. Max. wire size 12 AWG (2.5

Safety Agency Rating 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.

Outside Dimensions (H x Dia) 200 x 195 mm (7.9 x 7.7 in)

184 mm (7.2 in) front of ceiling tile to back of backcan

Cutout Size 168 mm (6.6 in)

Net Weight (each) 3.5 kg (8 lb)

Shipping Weight (pair) 8.0 kg (18 lb)

Included Accessories » C-shaped support backing plate

» 2 tile support rails (ﬁts both 2 x 4 ft or 600 x 1200 mm tiles)

» Cutout template

» Paint shield

» Removable locking wiring connector

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), average 100 Hz to 10 kHz

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.

Summary of content (4 pages)

PAGE 1
SPECSHEET Control® 24CT-BK Professional Series – Background/Foreground Ceiling Speaker Key Features: • Coaxially mounted 100 mm (4 in) woofer with butyl rubber surround and 19 mm (¾ in) titanium coated diffraction-loaded tweeter • High power, wide frequency response and low distortion for high sound level capability • Wide coverage allows fewer speakers, reducing the cost of the installed sound system without sacrificing performance • Packaged with grille, backcan and tile rails for fast installation and
PAGE 2
SPECSHEET Control® 24CT-BK Professional Series – Background/Foreground Ceiling Speaker Input connection is conveniently provided on a removable locking connector (included), providing secure connection via screw-down 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 loop-through wires, making it easy to jumper the speaker signal to additional speakers.
PAGE 3
SPECSHEET Control® 24CT-BK Professional Series – Background/Foreground Ceiling Speaker 1/3 Octave Polars: 1/3 Octave Polars
PAGE 4
SPECSHEET Control® 24CT-BK Professional Series – 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 (3/4 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.