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1 CT 108
CT 108 Fullrange Cabinet
The CT 108 is an extremely compact, passive
public address / full-range speaker cabinet.
Featuring a dual-purpose housing, it may be
employed as an FOH or delay speaker as well
as a stage monitor. It is an excellent choice for
rendering the human voice and acoustic
instruments. Hallmark features include superb
intelligibility, extraordinary phase linearity and
wide dynamic range. The CT 108 is available in
left and right versions. In combination with a
CT 118 subwoofer, it also serves as a small club
system.
The CT 108 may be operated with or without a
controller. For the best audio results, the use
of an HK AUDIO
®
DSM 2060 Controller or
HK AUDIO
®
Digital Field Controller is
recommended.
Application scenarios: Decentralized (public
address) sound reinforcement, playback or
instrument monitor in theaters and for
orchestras, and as a FOH mid-/high-range unit
for smaller club gigs.
Enclosure design and mechanical appointments
The CT 108’s enclosure is constructed of 12-mm,
9-ply birch plywood. Shaped to serve dual purpo-
ses, the housing is 23.5 cm wide, 40.5 cm high
and 23.5 cm deep, and weighs 8 kg. The surface is
coated with black water-repellent acrylic lacquer.
The front baffle is protected by a steel grille. The
enclosure’s panels are equipped with a total of
nine threaded M8 bushings fitted pair-wise in the
top and bottom panels, as well as the right and
left panels. A 360° mounting yoke and a 35-mm
pole mount adapter are optionally available.
Electrical and acoustical data:
The CT 108 features a direct-loaded 8"
HK AUDIO
®
Custom speaker and a 1" B&C high-
frequency driver with a 90° x 60° CD horn.
Courtesy of the housings’ foursquare design, the
horn may be rotated to 60° x 90° inside the
housing. The CT 108’s frequency response ranges
from 100 Hz to 19 kHz (+/- 3 dB). Nominal power
handling is 200 watts RMS at 16 ohms. Axial
sensitivity is 101 dB, measured under half-space
conditions at 1 watt @1m. Maximum SPL
measured under the same conditions at a
distance of one meter is 122 dB.
Connectors:
Connectors are located out of harm’s way on a
countersunk panel on the back of CT 108. This
panel offers two Speakon NL 4 ports. Both ports’
four pins are wired in parallel. Pin assignments
are pin 1+ = mid/high +, 1- = mid/high -, 2+ = sub
+, 2- = sub 2-.
1.1 Directivity, CT 108
The following charts depict horizontal and vertical
directivity at various frequencies. These data were
ascertained using -6 dB and -12 dB sound
pressure isobars.
Figure 2: Vertical directivity CT 108
Figure 3: Horizontal directivity CT 108
1.2 Adjusting Directivity
The HF horn’s mounting yoke is square, enabling
the horn to be rotated 90°. To do this, please
detach the front grille by unscrewing the screws
(M4 x 25 countersunk) on the side panels using a
Phillips screwdriver. Then remove the four M4x25
screws holding the horn in place. Now you can
rotate the horn by 90°.
1.3 Specifications, CT 108
Engineered to render audio signals with
consistently natural sound and considerable
dynamic range, this professional two-way speaker
system is designed for use as a fullrange cabinet
or a mid/high unit in combination with the CT 118
Sub or HK AUDIO
®
COHEDRA™ subwoofers. It is
loaded with an 8“ speaker mounted in a
precision-tuned bass reflex enclosure, and a 1"
high-frequency driver with a 2" voice coil
connected to a pivoting 90° x 60° / 60° x 90°
Constant Directivity horn. Made of 12-mm birch
plywood coated with black acrylic lacquer, the
dual-purpose housing can be placed at a 45° angle
for monitor applications. It is equipped with nine
threaded M8 bushings that accept accessory fit-
tings. An impact-resistant steel grille backed with
laminated acoustic foam rubber protects the front
baffle. An internal passive crossover splits the
signal at 1.8 kHz (12 dB / octave). Frequency
response ranges from 100 Hz to 19 kHz
(+/- 3 dB), with 101 dB axial sensitivity in the
main direction of throw @ 1W / 1 m under half-
space conditions and 128 dB maximum SPL at
10 % THD under half-space conditions. Power
handling is 200 watts RMS; nominal impedance is
16 ohms.
Connectors: 2x Neutrik NL 4 Speakon
Dimensions (W x H x D): 23.5 x 40.5 x 23.5 cm
Weight: 8 kg
Accessories: Mounting yoke, Pole Mount Adapter,
M8 Eyebolts
B ConTour Series™ Speakers
