Part No. 0026853 6/08
DESCRIPTION
The CIS991 ceiling loudspeaker features a powerful 3-way design
that provides exceptional performance, especially in high ceiling,
large-space applications. The CIS991 (80-degree by 80-degree
dispersion) incorporates four 5.25-inch LF cone woofers, four 4-inch
MF cone woofers and a 1-inch-exit HF compression driver mounted
on a large horn that foster superior pattern control. The application
of proprietary frequency shading techniques facilitates the eight
cone woofers working together to provide LF output and impact
equal to that of a 12-inch LF woofer.
The CIS991 is supplied with an integral 70V/100V line transformer,
rated to a maximum of 128 watts. Tap settings are adjustable by
means of a recessed rotary switch on the front bezel that allows
selection of 128-, 64-, 32-, and 16-watt taps at 70 volts, and 128-,
64-, and 32-watt taps at 100 volts. In addition, the transformer can
be bypassed, presenting an 8-ohm load to low-impedance systems.
A sealed, painted, 18-gauge steel back can is square in shape, and
designed to mount in a 24-inch ceiling grid. The back can includes
a recessed Euroblock input connector, with detachable mating
plug, concealed behind a hinged metal cover plate. A ceramic
screw terminal block is also present. Mounting is accomplished
using the integral eyebolts on the rear to suspend the loudspeaker
with optional, adjustable, wire rope rigging. A cable clamp secures
the incoming loudspeaker cable.
CIS
991
3-Way High-Output Ceiling Loudspeaker
• 3-way design for very high-quality, high-output reproduction
• Frequency-shaded passive crossover
• Unique driver array for wide-bandwidth pattern control
• 70.7/100V transformer with power-tap selector
• Fully appointed one-piece back can
Features
• Meeting Rooms
• Hotels
• Houses of Worship
• Boardrooms
• Courtrooms
• Multi-Purpose Facilities
• Multizone Paging/Music Systems
Applications
Eastern Acoustic Works | One Main Street | Whitinsville, MA 01588 USA | TEL toll free within US/Canada 800.992.5013
TEL outside US 508.234.6158 | FAX 508.234.8251 |
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SPECIfICaTIONS
CONfIguRaTION
Subsystem:
Transducer
Loading
LF 4x 5.25 in cone Sealed
MF 4x 4.5 in cone
Sealed
HF 1x 1 in exit
Horn
Operating Mode:
Amplifier Channels External Signal Processing
Single-amp LF/MF/HF HPF
PERfORMaNCE
Operating Range: 79 Hz to 20 kHz
Nominal Beamwidth: Horz 80°
Vert 80°
Axial Sensitivity (whole space SPL):
LF/MF/HF 92 dB 79 Hz to 20 kHz
Input Impedance (ohms):
Nominal
Minimum
LF/MF/HF 8
6.4 @ 1300 Hz
Input Taps (LF/MF/HF):
70 V: 128 W / 64 W / 32 W / 16 W
100 V: 128 W / 64 W / 32 W
High Pass Filter: High Pass=>60 Hz, 12 dB/octave Butterworth
Accelerated Life Test: LF/MF/HF 40 V 200 W @ 8 ohm
Calculated Axial Output Limit (whole space SPL):
Average
Peak
LF/MF/HF 114 dB 120 dB
PRELIMINAR
Y
