HK Audio CT 118 Sub - Manual (Page 9)

English
9
2 CT 112
CT 112 Fullrange Cabinet
The CT 112 is a passive speaker cabinet that may
also be configured in biamp mode. Courtesy of its
dual-purpose housing, it can serve as a FOH
speaker as well as a stage monitor. The CT 112’s
hallmarks include extremely high SPL and speech
intelligibility, extraordinary phase linearity,
considerable dynamic range and an HF horn
optimized with the BEM (Boundary Element
Method) ensure ultra precise directivity and
optimal clustering without phase cancellations.
Courtesy of its low-profile housing, it is also an
outstanding option for demanding stage monito-
ring applications. The Shape switch on its rear
panel reconfigures and optimizes the CT 112
crossover to satisfy the different requirements of
FOH and monitor applications. The CT 112 is
available in left and right versions for symmetrical
monitoring arrays. The CT 118 Sub subwoofer is
the recommended enhancement for setting up
powerful, two-way active systems.
The CT 112 may be operated in passive or biamp
mode with or without a controller. For the best
audio results, it is recommended that this
enclosure be operated with the HK AUDIO
® DSM
2060 Controller or HK AUDIO ® Digital Field Con-
troller (DFC) in combination with a DFC network.
Application scenarios: Full-range public address,
near-field sound reinforcement for applications
demanding high SPL, for example, as an FOH
mid-/high-range unit in live clubs, an ancillary
front fill for COHEDRA™ systems, a mid-/high-
range unit for side or drum fills and for
monitoring on larger stages.
Enclosure design and mechanical appointments:
The CT 112’s enclosure is constructed of 18-mm,
13-ply birch plywood. Shaped to serve dual func-
tions, the housing is 38 cm wide, 62 cm high and
34 cm deep, and weighs 25 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
two Aeroquip rigging tracks and two threaded
M10 bushings. The CT 112 may be flown horizon-
tally as well as vertically. Recessed handles are
located on the top and bottom panels of the
housing. An HK AUDIO
® TripleTilt™ Pole Mount
Adapter is on the bottom panel; it allows the
cabinet to be mounted on a tripod at three diffe-
rent tilt angles ( +5°, -3° or -10°).
Electrical and acoustical data:
The CT 112 features a direct-loaded 12" Neo-
dymium speaker and a 1.4" B&C high-frequency
driver with a 60° x 40° CD horn. Courtesy of the
housings’ foursquare design, the horn may be
rotated to 40° x 60° inside the housing. The
CT 112’s frequency response ranges from 80 Hz to
16 kHz (+/- 3 dB). Nominal power handling is
400 watts RMS at 8 ohms. Axial sensitivity is
107 dB, measured under half-space conditions at
1 watt @1m. Maximum SPL measured under the
same conditions at a distance of one meter is
134 dB.
Connectors:
Connectors, the Passive/Biamp switch and the
Shape switch are located out of harm’s way on a
countersunk panel on the back of the CT 112. This
panel offers two Speakon NL 4 ports. Both ports’
four pins are wired in parallel. Pin assignments in
passive mode are pin 1+ = mid/high +, 1- =
mid/high -, 2+ = sub +, 2- = sub 2-. In biamp
mode, the HF signal is routed via pin 1+ / 1-. The
LF/MF signal is routed via pin 2+ / 2- of the
Speakon connectors.
2.1 Directivity, CT 112
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 7: Vertical directivity CT 112
Figure 8: Horizontal directivity CT 112
2.2 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°.
2.3 Shape and Mode Switches
The CT 112 features a Shape switch on its rear
panel. This switch optimizes the passive cross-
over, enabling the cabinet to be used as an FOH
speaker or as a (passive) monitor. When the
switch is set to the Monitor position, the 1.4"
driver’s dampening factor is reduced to ensure
the speakers cuts through on loud stages.
The Mode switch configures the CT 112 for
passive or bi-amp modes. In bi-amp mode, the
12" speaker’s passive crossover is deactivated,
though the 1.4" driver’s slight pre-dampening -
accomplished using passive components -
remains enabled. The HK AUDIO
® Controller
DSM 2060 is equipped with a factory preset filter
for bi-amp mode. When configuring the enclosure
for bi-amp mode, set the Shape switch to the
position labeled Monitor!
Figure 9: Monitor and
Shape switches
2.4 Specifications, CT 112
Engineered to render audio signals with
consistently natural sound and considerable
dynamic range, this professional two-way speaker
system features a BEM-optimized HF horn for
precise directivity and optimal clustering without
phase cancellations. It is designed for use as a
fullrange speaker or as a mid/high unit in
combination with the CT 118 Sub or HK AUDIO
®
COHEDRA™ subwoofers. It is loaded with a 12"
Neodymium low-/ midrange woofer mounted in a
precision-tuned bass reflex enclosure, as well as a
1.4" high-frequency driver with a 3" voice coil
connected to a pivoting 60° x 40° / 40° x 60°
Constant Directivity horn. Made of 18-mm birch
plywood coated with black acrylic lacquer, the
dual-purpose housing can be placed at 47° and
18° angles for monitor applications. It is equipped