In-Ceiling Speaker
CM890i
Preliminary Technical Information for System Engineers
Preliminary Technical Information
The information in this document reflects
preliminary data. Items including polar
plots, frequency, phase and impedance
response graphs will be added when final
data are available.
Key Features
• BroadBeamHP® waveguide technology
delivers a consistent dispersion pattern
for maximum coverage area per speaker
(up to 10 kHz, EASE™ documented).
Tile bridge included
Specifications: CM890i
System Type
8” Coax, compression tweeter w/ 1” exit, in-ceiling, ported (66
Watt transformer for 25/70.7/100 Volt or voice coil / 8 Ohm direct)
Frequency Response (- 3 dB)1
Low Frequency (-10 dB)1
Max. Program Power
Max. Continuous Power RMS2
Max. UL program power3
Max. SPL dB @ 1 M
Sensitivity dB @ 1W/1M4
Impedance (nominal)
Coverage Angle (-6 dB @ 2 kHz)
Coverage Angle (-6 dB @ 8 kHz)
Directivity Factor (Q)
77 Hz - 20 kHz
63 Hz - 20 kHz
250 Watts
125 Watts
65 Watts
116 dB
95 dB
8 Ohm
100º
• 66 Watt transformer and high output
(116 dB) for the sound reinforcement and
PA markets.
• One 203 mm (8.0 in) treated fiber driver
and one compression driver with a 25.4 mm
(1 in) exit mounted to a proprietary cast-
aluminum M8™ baffle and heat sink.
110º
• 95 dB Average sensitivity offers high-
output capabilities and reduced amplifi-
cation costs.
5.35 (Averaged 100 Hz - 10 kHz); 7.89 @ 2 kHz
6.49 dB (Averaged 100 Hz - 10 kHz); 8.97 dB @ 2 kHz
6-Position rotary switch with voice coil direct (8 Ohm)
Directivity Index (DI)
Tap Selector
• Separate tool-free magnetic grille &
bezel assembly for ease of install and
in-field painting.
Transformer Taps
70.7 V Output
66 W 113 dB
35 W 110.5 dB
19 W 108 dB
10 W 105 dB
5 W 102 dB
100 V Output
66 W 113 dB
35 W 110.5 dB
19 W 108 dB
10 W 105 dB
25 V Output
5 W 102 dB
2.5 W 99 dB
1.25 W 96 dB
0.75 W 94 dB
• Iridite-plated, steel grille with protective
powder-coated finish for lasting durability.
• Rapid-installation blind mount fixed
wing mounting mechanism with con-
stant tension design affixes to ceiling
thickness tolerances ranging from 6.4
mm (0.25 in) to 42.9 mm (1.69 in).
Transducers
Low Frequency Driver
High Frequency Driver
Low Frequency Voice Coil
Crossover Frequency
1 x 203 mm (8 in) Treated fiber cone, cloth surround
1 Compression driver with waveguide and a 25.4 mm (1”) exit
34 mm (1.36 in)
• UL 2043 approval pending.
2.4 kHz
• Included accessories: Tile bridge,
Euroblock connector & paint mask
/installation aid.
Network Type
Low Pass
High Pass
Enclosure Material
Motor-Board
Grille
12 dB per octave, 2nd order
12 dB per octave, 2nd order
Drawn aluminum backcan with ABS baffle
Cast aluminum
Iridite-plated steel with powder-coat finish
4 Pin, 5 mm Euroblock for individual or daisy chain connection
Black or white
296.7 mm / 11.68 in
201.7 mm / 7.94 in
375.0 mm / 14.76 in
27.5 mm / 1.08 in
• Optional accessories: Pre-Construc-
tion Bracket
Inputs
Colors
Description
The CM890i is a premium 8.0” 2-way,
in-ceiling, high-efficiency, high-SPL
Backcan Diameter
Backcan Height
Visible Diameter
Visible Height
Weight
loudspeaker for distributed or 8 Ohm
applications. The CM890i incorporates
a dedicated 8.0” treated fiber driver and
high-power compression transducer with
a BroadBeamHP® waveguide to deliver a
consistent dispersion pattern and superb
intelligibility for the foreground music,
sound reinforcement and PA markets. The
CM890i also incorporates a 66 Watt trans-
former with a 6-position tap switch and
voice coil/8 Ohm direct position. Mount-
ing hardware and tile-bridge are included
and feature a fast and secure constant-ten-
sion fixed wing mounting system.
6.5 kG / 14.3 lbs
N/A
Shipping Weight
Accessories
Included
Optional
Tile bridge, Euroblock connector, back cover plate & installation aid
Pre-Construction Bracket (AC-CM8-PCB),
Junction Box (AC-CM-JBOX)
Packaging
2 per box
1
2
3
4
Frequency response is measured in half space.
Continuous power rating, EIA-426-B test.
UL testing specifies band-limited pink noise over the indicated frequency spectrum.
2.83 Volts at a distance of 1 meter.
SoundTube continually develops new product innovations and improvements. Updates to existing
products without prior notice are an example of SoundTube’s drive for constant improvement.
© 2006 SoundTube Entertainment. All rights reserved. PN TS-CM590 REV 04.04.06
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In-Ceiling Speaker
CM890i
Preliminary Technical Information for System Engineers
is an audio system with fewer speakers,
reduced power needs, shorter installation
time and cost savings on shipping and labor.
lows: Useable frequency response shall
extend from 63 Hz – 20 kHz (-10 dB, no
external equalization). Measured sensitiv-
ity (2.83 Volt input, 1 meter) shall be at
least 95 dB. The speaker shall have a nomi-
nal impedance of 8 Ohms and available
for 25/70.7/100 Volt modes with a voice
coil/8 Ohm direct. The frequency-dividing
network shall have a crossover frequency
of 2.4 kHz with a slope of 12 dB per octave
(2nd order). Rated power capacity shall
be at least 125 Watts continuous power
(RMS), and shall conform to EIA-426-B
testing. Maximum continuous output at 1
meter shall be 116 dB.
Data Acquisition
All performance data acquired at
SoundTube’s Technical Measurement
Center (TMC) are analyzed using a
variety of standard measurement tech-
niques, including Measured Length
Sequence (MLS) and Time Delay Spec-
trometry (TDS). Performance, develop-
ment and data acquisition tools include:
Gold Line TEF 20, CLIO, LMS, LEAP, and
proprietary modeling software. EASE™
data are acquired through an automated
TEF 20/Outline/EASE™ interface.
Patented SoundTube
Technologies
SoundTube entertainment is consis-
tently developing new technologies that
enhance audio product performance.
SoundTube Entertainment innovations
are protected by multiple U.S. and
international patents, which explicitly
cover SoundTube dome, enclosure
mounting and dispersion technolo-
gies. SoundTube Entertainment actively
defends its patents in order to protect
SoundTube resellers and end-users.
EASE™ Data – 3-D polar plots.
SoundTubeSPEC™ – Proprietary
SoundTube speaker placement software.
The low-frequency transducer shall
have a treated fiber cone and cloth sur-
round.
Installation for the CM890i shall be
by 2-screw blind mount, constant ten-
sion winged assembly and shall attach
to ceiling thickness tolerances ranging
from 6.4 mm (0.25 in) to 42.9 mm (1.69
in). The external wiring input connector
shall be a 4-pin, 5 mm Euroblock connec-
tor for 8 Ohm or distributed systems and
shall accept from 10 – 22 gauge wire. The
maximum backcan dimension shall be
no more than 201.7 mm (7.94 in) in height
Architectural Specifications
Technical Data and
Specification Tools
The loudspeaker shall consist of a 203
mm (8 in) low-frequency transducer and
a high frequency transducer with a 1”
exit and a frequency-dividing network
installed in a ported enclosure. The low-
frequency voice coil diameter shall be 34
mm (1.36 in).
Technical Data
SoundTube Entertainment strives to
provide complete and effective technical
information and data to dealers,
engineers and designers. All data are
available from SoundTube Entertain-
The performance specifications of a
typical production unit shall be as fol-
Polar Plots
N/A
™
™
Technical data, EASE plots, SoundTubeSPEC software & product downloads available at www.soundtube.com
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In-Ceiling Speaker
CM890i
Preliminary Technical Information for System Engineers
by 296.7 mm (11.68 in) in diameter. The
maximum visible dimensions shall be
no more than 27.5 mm (1.08 in) in height
by 375 mm (14.76 in) in diameter. The
backcan shall be constructed of alumi-
num.
Mechanical Drawings
Side
Top
The system shall include a 16-gauge
painted steel support backing plate (tile
bridge) to reinforce the ceiling material
and tile support rails. The maximum
tile bridge dimensions shall be no more
than 600.1 mm (23.62 in) in length by
428.2 mm (16.86 in) in width and 10.4
mm (0.41 in) in thickness with a 325 mm
(12.80 in) cutout for speaker mounting.
296.7 mm
(11.68 in)
201.7 mm
(7.94 in)
375 mm (14.76 in)
27.5 mm (1.08 in)
The grille shall be constructed of iri-
dite-plated, powder-coated steel with an
ABS bezel. The affixed grille and bezel
shall be mounted to the speaker enclo-
sure (backcan) via magnetic attachment
and include a safety wire. Also included
are a paint mask for in-field painting
and an installation aid that serves as a
handhold during mounting.
Included Accessories
The CM890i has an optional Pre-Con-
struction Bracket (AC-CM8-PCB) that
shall be compatible with an optional
Junction Box (AC-CM-JBOX). An 18-
gauge wire whip and Euroblock connec-
tor shall be included with the Junction
Box. The maximum dimensions of the
Pre-Construction Bracket shall be no
more than 635 mm (25 in) in length by
457.2 mm in width and 127 mm (5 in) in
thickness with a 326.1 (12.85 in) cutout
for speaker mounting.
325.1 mm
(12.80 in)
600.1 mm
(23.62 in)
Max.
42.9 mm (1.69 in)
Min.
6.4 mm (0.25 in)
Fixed Wing Mounting System
428.2
(16.86 in)
Tile Bridge
The system shall be the CM890i with
mounting hardware for both low- and
high- impedance applications.
Paint Mask
SoundTube Entertainment
6430 North Business Park Loop
Park City, Utah 84098
Optional Accesories
Phone 435.647.9555
Fax
435.647.9666
Toll Free 800.647.TUBE
All SoundTube products come
with a 5-year limited warranty.
Pre-Construction Bracket (AC-CM8-PCB)
Junction Box (AC-CM-JBOX)
SoundTube Entertainment manufactures a complete line of speakers for:
Open-Ceiling • In-Ceiling • Surface-Mount • Outdoor • Sound-Focusing
All SoundTube products are designed and engineered in the USA.
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