Owner's Manual

Table Of Contents

Control

24C/CT Micro

Professional Series – Background Music Ceiling Speaker

SPECSHEET

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

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 (4.1 in).

Control 24C Micro: Nominal impedance shall be 8 ohms. The

loudspeaker shall weigh 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 9W @ 70V, 4W @ 70V

(9W @ 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).

Horizontal 1/3 Octave Polars