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Technical data, EASE
™
plots, SoundTubeSPEC
™
software & product downloads available at www.soundtube.com
CM500i
In-Ceiling Speaker
Preliminary Technical Information for System Engineers
Patented SoundTube
Technologies
SoundTube Entertainment is con-
stantly developing new technologies
that enhance audio product per-
formance. SoundTube Entertainment
innovations are protected by multiple
U.S. & international patents, which
explicitly cover SoundTube dome,
enclosure and dispersion technologies.
SoundTube Entertainment actively
defends its patents in order to protect
SoundTube resellers and end users.
Technical Data and
Specification Tools
Technical Data
SoundTube Entertainment strives to
provide complete and effective technical
information and data to dealers, engi-
neers and designers. All data are avail-
able from SoundTube Entertainment or
at www.soundtube.com.
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.
EASE™ Data
– 3-D polar plots.
SoundTubeSPEC™
– Proprietary
SoundTube speaker placement software.
Architectural Specifications
The loudspeaker shall consist of a 133
mm (5.25 in) low-frequency transducer
and a 25 mm (1.0 in) high-frequency
transducer with a crossover network
installed in the enclosure. The low-fre-
quency voice coil diameter shall be 25
mm (1.0 in).
Performance specifications of a typi-
cal production unit shall be as follows:
Useable frequency response shall extend
from 55 Hz – 22 kHz (-10 dB, half space,
no external equalization). Measured
sensitivity (2.83 Volt input, 1 meter)
shall be at least 88.5 dB. The speaker
10,000 Hz
8,000 Hz4,000 Hz
2,000 Hz
1,000 Hz
500 Hz250 Hz
125 Hz
Polar Plots
shall have a nominal impedance of 8
Ohms and be available for 25, 70.7 & 100
Volt modes with voice coil/8 Ohm direct.
The frequency-dividing network shall
have a crossover frequency of 3 kHz with
slopes of 12 dB per octave (2nd order) for
both low & high pass filters. Rated power
capacity shall be at least 75 Watts continu-
ous power (RMS) and conform to EIA-426-
B testing. Maximum continuous output at
1 meter shall be 107.5 dB.
The low-frequency transducer shall
have a polypropylene cone with rubber
surround. The high-frequency transducer
shall be constructed of aluminum with a
proprietary BroadBeam
®
waveguide.
Installation for the CM500i shall be by
2-screw, blind-mount, constant tension
winged assembly and shall attach to ceil-
ing thickness tolerances ranging from
6.4 mm (0.25 in) to 42.9 mm (1.69 in). The
fixed-wing assembly shall be constructed
of glass-filled ABS material. The external
wiring input connector shall be a 4-pin,
5 mm Euroblock for 8 Ohm or distributed
systems and shall accept from 10 – 22
gauge wire.