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4 CT 118 Sub
CT 118 Sub Subwoofer
The CT 118 Sub is a direct-radiating bass reflex
subwoofer designed for use in active sound
reinforcement systems. It was developed
specifically for deployment in combination with
the ConTour Series™ cabinets CT 108, CT 112 and
CT 115. Loaded with a neodymium woofer, the
CT 118 Sub is extremely compact and light-weight.
Delivering uniform bass response, it renders
impulses with accuracy and authority even at peak
loads. The CT 118 Sub is the perfect choice of
bass bin for setting up high-performance front-of-
house systems and drum/side fills.
The CT 118 Sub can be retrofitted with an optional
passive crossover. The passive crossover is
equipped with bona fide low-pass and high-pass
filters enabling the configuration of basic satellite
systems without having to resort to further power
amps or active crossovers. This makes it the ideal
no-hassle option for enhancing low-end response.
For maximum performance, it is recommended
that this enclosure be operated with an
HK AUDIO
®
DSM 2060™ Controller or an
HK AUDIO
®
Digital Field Controller™ (DFC) in
combination with a DFC network.
Application scenarios: Low-frequency enhance-
ment for setups entailing CT 108, CT 112 and
CT 115 speakers.
Enclosure design and mechanical appointments:
The enclosure is constructed of 18-mm, 13-ply
birch plywood. The housing is 50 cm wide, 60 cm
high and 68 cm deep, and weighs 42.5 kg. The
surface is coated with black water-repellent acrylic
lacquer. The front baffle is protected by a steel
grille. One recessed handle each is located on the
side panels. An M20 Pole Mount Adapter
provides the base for a pole designed to accept a
CT 108, CT 112 or CT 115 enclosure used in
satellite systems. An optionally available dolly
equipped with four 100-mm castors makes the
cabinet easy to transport.
Electrical and acoustical data:
The CT 118 Sub features a direct-loaded 18"
neodymium speaker. The CT 118 Sub’s frequency
response ranges from 41 Hz to 350 kHz
(+/- 3 dB). Nominal power handling is 1,000
watts RMS at 8 ohms. Axial sensitivity is 100 dB,
measured under half-space conditions at 1 watt
@1m. Maximum SPL measured under the same
conditions at a distance of one meter is 129 dB.
Connectors:
Connectors*) are located out of harm’s way on a
countersunk panel on the back of the CT 118 Sub.
This panel offers two Speakon NL 4 ports. Both
ports’ four pins are wired in parallel. Pin assign-
ments are pin 1+ = mid/high +, 1- = mid/high -,
2+ = Sub +, 2- = Sub 2-.
*) without a passive crossover
4.1 Optional Passive Crossover for the CT 118 Sub
Figure 19: Passive crossover for the
CT 118 Sub
The passive crossover is equipped with full-
fledged low-pass and high-pass filters. They
enable you to set up basic passive satellite
systems without requiring further power amps or
active crossovers.
To install the crossover, proceed as follows:
Remove the front grille and the 18" speaker. Then
replace the internally mounted connector panel
with the passive crossover. Reconnect the 18“
speaker to the two ends of the speaker wires.
Ensure the polarity is correct! Red marks the
positive terminal, and black the negative terminal!
Handling:
On the passive crossover’s connector panel you
will find a selector switch that serves to deactivate
the crossover’s low-pass filter for the 18" speaker.
If you intend to use the CT 118 Sub in an active
setup (that is, bi-amped), set the switch to Cross-
over OFF. For a passive configuration with a
satellite speaker (mid-/high-range unit), set the
switch to Crossover ON. In this case, be sure to
connect the satellite speaker (mid-/high-range
unit) to the Satellite Out port. For active two-way
mode, connect the satellite speaker to the Output
port (and not to Satellite Out!). Ensure that the
signal destined for the satellite speaker is routed
via pins 1+ and 1- of the Speakon connectors! The
subwoofer signal is then routed via pin 2+ and 2-.
4.2 Specifications, CT 118 Sub
A professional subwoofer loaded with an 18"
neodymium woofer mounted in a precision-tuned
bass reflex enclosure, the CT 118 Sub delivers low-
ranging, dynamic bass response to enhance
ConTour Series™ cabinets’ low-end performance.
The rectangular block housing is made of 18-mm
birch plywood coated with black acrylic lacquer.
The top panel features indentations to accept the
feet of a subwoofer stacked on top of the
enclosure, while a recessed threaded M20
bushing accepts an optional mounting pole. An
impact-resistant steel grille backed with lamina-
ted acoustic foam rubber protects the front baffle.
Recessed handles are located on the side panels.
Crossover frequencies are determined by an
HK AUDIO
®
DSM 2060 Controller using a 4th-
order Hardman low-pass filter at 100 Hz and a
4th-order Hardman high-pass filter at 30 Hz.
Frequency response without a controller ranges
from 32 Hz to 350 Hz (-10 dB ), with 100 dB axial
sensitivity in the main direction of throw
@1W/1m under half-space conditions, and 129 dB
maximum SPL at 10% THD under half-space
conditions. Nominal power handling is 1,000
watts RMS at 8 ohms impedance.
Connectors: 2x Neutrik NL 4 Speakon
Dimensions (W x H x D): 50 cm x 60 cm x 68 cm
Weight: 42.5 kg
Accessories: Dolly with butterfly latches and 100-
mm castors, Cover, Passive Crossover with
Satellite Out for CT108, CT112, and CT115
enclosures.
