QSC KS112, KS118, KS212C User manual

KS Series

User Manual

KS112 – 2000 watt Active Subwoofer

KS118 – 3600 watt Active Subwoofer

KS212C – 3600 watt Active Cardioid Subwoofer

KS112

®

KS118

TD-001536-01-B

*TD-001536-01*

KS212C

EXPLANATION OF SYMBOLS

The term “WARNING” precedes instructions that concern personal safety. Failure to follow them may result in bodily
injury or death.

The term “CAUTION” precedes instructions that concern possible damage to physical equipment. Failure to follow them
may result in equipment damage to equipment that may not be covered under the warranty.

The term “IMPORTANT” precedes instructions or information that are vital to the successful completion of
theprocedure.

The term “NOTE” precedes additional useful information.

NOTE: The lightning flash with arrowhead symbol in a triangle alerts the user to the presence of uninsulated
dangerous voltage within the product’s enclosure that may constitute a risk of electric shock to humans.

NOTE: The exclamation point within a triangle alerts the user to important safety, operating, and
maintenance instructions in this manual.

IMPORTANT SAFETY INSTRUCTIONS

WARNING: TO PREVENT FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT
USE THIS APPARATUS NEAR WATER.

1. Read these instructions and keep a copy for future reference.

2. Strictly follow and heed all instructions and warnings.

3. Do not use or submerge this loudspeaker product in or near water or liquids.

4. Clean only with a dry cloth. Do not use any aerosol spray, cleaner, disinfectant or fumigant on, near, or into the
loudspeaker.

5. Do not block any ventilation opening. Install in accordance with the manufacturer’s instructions.

6. Do not install the loudspeaker near any heat sources, such as radiators, heat registers, stoves, or other apparatus
(including amplifiers).

7. Use extra caution with any attachments, accessories, mounts, or brackets that are not specified or approved by
QSC, LLC.

8. Refer all service to qualified personnel. Service is required if the loudspeaker has been damaged in any way, such as
liquid being spilled into it, objects falling into it, exposure to rain or moisture, abnormal operation, or being dropped.

9. Observe all applicable local codes.

10. Consult a licensed, professional engineer when any doubt or questions arise regarding a physical equipment
installation.

11. Do not attempt to defeat the safety features of the grounding-type plug, which has two blades plus a grounding
prong. The grounding prong ensures your safety; plug the power cord into only a properly grounded or earthed
outlet. If the plug provided does not fit into an outlet, have an electrician replace the obsolete outlet. Unplug the
loudspeaker during lightning storms or when unused for long periods of time.

12. Protect the power cord from damage. Do not allow it to be stepped on or pinched, especially at plugs, convenience
receptacles, and chassis entry points.

TD-001536-01-B

2

Maintenance and Repair

WARNING: Advanced technology—e.g., the use of modern materials and powerful electronics—requires specially
adapted maintenance and repair methods. To avoid subsequent damage to the equipment, personal injury, and/or creation
of additional safety hazards, have all maintenance or repair work on the equipment performed only by a QSC authorized
service center or an authorized QSC International Distributor. QSC is not responsible for any injury, harm, or related
damages that arise from any failure of the customer, owner, or user of the equipment to facilitate those repairs.

Life Cycle: 10 years Storage Temperature range: -20° C to +70° C Relative Humidity range: 5 - 85% RH

FCC Statement

NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules.

These limits are designed to provide reasonable protection against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference
will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception,
which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by
one or more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

• Consult the dealer or an experienced radio/TV technician for help.

RoHS Statements

These products are in compliance with “China RoHS” directives per GB/T26572. The following table is provided for
product use in China and its territories:

The KS112, KS118 and KS212C 这些产品

有害物质

部件名称

(Part Name)

电路板组件

(PCB Assemblies)

机壳装配件

(Chassis Assemblies)

本表格依据 SJ/T 11364 的规定编制。(This table is prepared following the requirement of SJ/T 11364.)
O: 表示该有害物质在该部件所有均质材料中的含量均在 GB/T 26572 规定的限量要求以下。
O: Indicates that the concentration of the substance in all homogeneous materials of the part is below the relevant threshold speci󽗉ed in
GB/T 26572.
X: 表示该有害物质至少在该部件的某一均质材料中的含量超出 GB/T 26572 规定的限量要求。
X: Indicates that the concentration of the substance in at least one of all homogeneous materials of the part is above the relevant threshold
speci󽗉ed in GB/T 26572.

（目前由于技术或经济的原因暂时无法实现替代或减量化) (Replacement and reduction of content cannot be achieved currently because of the

technical or economic reason.)

铅

(Pb)

X O O O O O

X O O O O O

汞

(Hg)

(Hazardous Substances)

镉

(Cd)

六价铬
(Cr(vi))

多溴联苯

(PBB)

多溴二苯醚

(PBDE)

3

TD-001536-01-B

Warranty

For a copy of the QSC limited warranty visit the QSC website at www.qsc.com

Package Contents

KS112, KS118, or
KS212C subwoofer

QSC limited
warranty
TD-000453

35 mm M20 915 mm
(36 in) loudspeaker
pole (included with the
KS212C only)

1

1

1

Locking
AC power cord

Quick start guide
TD-000499 – KS212C
TD-001518 – KS112
TD-001551 – KS118

1

1

2

White QSC logo

1

Powered loudspeaker
safety sheet
TD-000337

TD-001536-01-B

4

KS112 / KS212C Features

1

2

3

4

5

6

10

1

Top Bottom

Horizontal Top

7

8

Horizontal Bottom

Front

Rear

7

3

1. Alignment cups for stacking

2. Four low-noise, heavy-duty casters

9

– Figure 1 –

9. Front power LED

10. Amplifier power module and controls

3. Amplifier protection rails

4. M20 threaded socket for 35 mm loudspeaker pole

5. Slip-resistant feet - four on the bottom

6. Slip-resistant feet - four on the side

7. Cast aluminum handles

8. M20 threaded socket for 35 mm loudspeaker pole

5

TD-001536-01-B

KS118 Features

1

2

3

7

7

5

6

9

3

5

Left Side

Right Side

To p

4

Front

Bottom

Rear

8

– Figure 2 –

1. Alignment cups for stacking

2. Four low-noise, heavy-duty casters

3. Amplifier protection rails

4. M20 threaded socket for 35 mm loudspeaker pole

8. Front power LED

9. Amplifier power module and controls

5. Slip-resistant feet - four on the bottom

6. Slip-resistant feet - four on the side

7. Cast aluminum handles

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6

About Cardioid Subwoofer Radiation

The term cardioid refers to a heart-shaped coverage pattern of an audio device. For example, a cardioid microphone is
most sensitive at the front (on-axis), and least at the rear (180 degrees off-axis). A cardioid subwoofer operates the same
way and is loudest at the front and quietest at the rear.

Subwoofer Energy Dispersion

Typical

Rear

– Figure 3 –

Low frequency energy from a conventional subwoofer is effectively omnidirectional below 200 Hz. This is because the
directivity of the subwoofer is related to the ratio of its size to the length of the sound wave it produces. The length of the
sound wave is inversely proportional to its frequency, and therefore when the low frequency waves are much longer than
the dimensions of the subwoofer transducer and enclosure, the radiation pattern becomes more equal in all directions,
including to the sides and back.

A cardioid subwoofer arrangement employs both front- and rear-firing woofers. Some clever use of spacing, delay, and
polarity produces cancellation in the rear-firing energy and reinforcement in the forward-firing energy. Historically, creating
cardioid subwoofer arrays has required the user to make complicated calculations involving physical spacing and signal
processing. Two QSC subwoofer models make those calculations unnecessary.

Cardioid

Rear

d

5

B

1

-

FrontFront

KS212C

The KS212C is powered by a dual 1800-watt Class D amplifier and incorporates dual 12-inch long-excursion drivers that
are each arranged in a sixth-order bandpass chamber. QSC’s latest DSP technology performs the complex processing
that makes these mirrored components interact at the rear of the enclosure to produce a desirable cancellation, while
simultaneously interacting at the front of the enclosure to produce equally desirable summation. As a result, the output
pattern is a cardioid shape, with 15 dB higher level at the front than at the rear. To put this into perspective, 15dB is
equivalent to the difference between 30 watts of power and 1000 watts.

KS118

The KS118 is a very high output active subwoofer, powered by a 3600-watt Class D amplifier driving a single 18-inch
direct radiating driver. Its on-board DSP menu offers the option of arraying two or more units in a forward/backward
cardioid arrangement with 15 dB of rearward rejection. From the subwoofers’ Cardioid menu, select Forward for the
units facing the audience and Rear for the ones facing away. This also allows side-by-side or ground-stacked setups.

7

TD-001536-01-B

KS212C Applications and Installation

WARNING: The KS212C subwoofer is not suitable for flying or suspension.

Before placing, installing, or mounting a subwoofer check all hardware, cabinets, transducers, brackets, and associated
equipment for damage. Missing, corroded, deformed, or non-load-rated components could significantly weaken the
installation or placement and severely reduce the safety of the installation if left uncorrected. Use only hardware that is
rated for the loading conditions of the installation as well as any possible short-term overloading.

Never exceed the load rating of the hardware or equipment.

Consult a licensed professional engineer regarding physical equipment installation. Understand and follow all local, state,
and national regulations regarding the safety and operation of loudspeakers and related equipment.

IMPORTANT: To maintain the acoustic properties of the
KS212C subwoofer do not place the unit closer than 50mm (20
in) from a wall or other object that would reflect sound waves.

Placement of the KS212C

Make sure that the KS212C sub is placed no closer than
20inches (50cm) to the back wall of the stage.

Side-by-side KS212C subs should be at least 20inches (50 cm)
away from each other.

Front of Stage

Minimum 20 in / 50 cm

Back Wall of Stage

Stacking the KS212C

KS212C subwoofers can stack in a horizontal orientation. The four
rubber feet on the top subwoofer fit perfectly into the four cups on
the bottom one (Figure 5). Do not stack more than two KS212C
subwoofers because it will reduce rear attenuation.

• One subwoofer: 15 dB front-to-rear attenuation at 70 Hz

• Two subwoofers stacked: 12.5 dB front-to-rear attenuation at 70 Hz

• Three subwoofers stacked: 10 dB front-to-rear attenuation at 70 Hz

A stack of two subwoofers can support a loudspeaker, including a pole-mounted one.

WARNING: Do not stack the KS212C units in a vertical orientation.

– Figure 4 –

TD-001536-01-B

– Figure 5 –

8

KS112 Applications and Installation

Stacking the KS112

KS112 subwoofers can stack in a horizontal orientation. The four rubber feet on the
top subwoofer fit perfectly into the four cups on the bottom one (Figure 6).

WARNING: The KS112 subwoofer is not suitable for flying or suspension.

Before placing, installing, or mounting a subwoofer check all hardware, cabinets,
transducers, brackets, and associated equipment for damage. Missing, corroded,
deformed, or non-load-rated components could significantly weaken the
installation or placement and severely reduce the safety of the installation if left
uncorrected. Use only hardware that is rated for the loading conditions of the
installation as well as any possible short-term overloading.

Never exceed the rating of the hardware or equipment.

Consult a licensed professional engineer regarding physical equipment
installation. Understand and follow all local, state, and national regulations
regarding the safety and operation of loudspeakers and related equipment.

WARNING: Do not stack the KS112 units in a vertical orientation.

– Figure 6 –

KS118 Applications and Installation

The KS118 subwoofer can be used as a single low-frequency acoustic source or in multiples for more coverage and low­frequency energy.

Single-subwoofer applications typically support a stereo pair of top loudspeakers. For most even coverage, place the
subwoofer centrally between the pair, if it is possible. It is often necessary, though, to place the subwoofer off to the side,
which will usually produce satisfactory results.

Placing subwoofers to the left and right sides of a stage is often convenient, but it tends to create a concentration of bass
energy up the middle of the audience area, often nicknamed “Power Alley.” To prevent this, try clustering the subwoofers
in the middle or spread them across the front of the stage.

WARNING: The KS118 subwoofer is not suitable for flying or suspension.

9

TD-001536-01-B

Cardioid Configurations

Two or more KS118 subwoofers can be arranged and configured to produce a cardioid radiation pattern very simply,
with no complex calculations or processing settings required. The processing necessary for cardioid operation is already
programmed into each KS118 subwoofer’s DSP. On each subwoofer facing forward (toward the audience), select
FORWARD on the Cardioid menu. On each subwoofer facing away from the audience, select REAR on the Cardioid
menu. Put the same audio signal into both subwoofers and set the same gain on each one.

BEST: Back-to-back

Placing the subwoofers back­to-back offers the best cardioid
performance, with 15 dB of sound
attenuation to the rear. Figure 7 is a
top view of two KS118 subwoofers
oriented vertically and placed back­to-back. Figure 8 also is a top view
of a back-to-back arrangement,
but with the subwoofers oriented
horizontally.

Cardioid > Rear Cardioid > Forward

Toward audience

– Figure 7 –

Cardioid > Rear Cardioid > Forward

Toward audience

GOOD: Side-by-side

Placing the KS118 subwoofers side-by-side (Figure 9) may save
space but creates a less precise cardioid pattern.

– Figure 8 –

Cardioid > Forward

Toward audience

TOP VIEW

Cardioid > Rear

– Figure 9 –

TD-001536-01-B

10

BETTER: Stacked

Stacking two KS118 subwoofers is similar to the side-by-side arrangement.
Figure 10 is a front view. Place the rear-facing subwoofer on the bottom.

Cardioid > Forward

FRONT VIEW
(as seen from

audience)

Cardioid > Rear

Floor

– Figure 10 –

Three-box cardioid systems

A three-box array, with two forward­facing and one facing to the rear,
gives additional acoustic output
to the front but with slightly less
optimal rear attenuation.

Figure 11 is a top view of a back-to­back three-box array.

Figure 12 is a front view of a
stacked three-box array. Use the
bottom subwoofer as the rear­facing one.

Cardioid > Forward

Toward audience

Cardioid > Rear

– Figure 11 –

11

Cardioid > Forward

FRONT VIEW
(as seen from

audience)

Cardioid > Rear

Floor

– Figure 12 –

TD-001536-01-B

Pole-Mounting Loudspeakers over a Subwoofer

NOTE: Figures 13 and 14 depict the KS212C
but the KS112 has similar pole-mounting
features. See the tables below for individual
requirements.

The KS112 and KS212C Subwoofers are equipped with
two M20 threaded sockets: one on the top, and one on the
side. The KS118 has a single M20 threaded socket.

Figure 13 shows a KS Series Subwoofer in a vertical
orientation with a K.2 Series loudspeaker mountedabove.

Figure 14 shows a KS Series Subwoofer in a horizontal
orientation with a K.2 Series loudspeaker mountedabove.

Use the tables below to determine which poles are safe
to use with the various CP, KW, KLA, K.2, and K Series
loudspeakers and your KS Series Subwoofer in a horizontal
or vertical orientation.

4 = OK to use

6 = Not recommended (see note on next page)

– Figure 13 – – Figure 14 –

KS212C

SP-16X Ext. Pole

SP-26 Pole

SP-36 Pole

SP-16X + SP-26 Poles

SP-16X Ext. Pole

SP-26 Pole

SP-36 Pole

SP-16X + SP-26 Poles

KS112

SP-16X Ext. Pole

SP-26 Pole

SP-36 Pole

SP-16X + SP-26 Poles

SP-16X Ext. Pole

SP-26 Pole

SP-36 Pole

SP-16X + SP-26 Poles

K8.2/

CP8

4 4 4 4 4 4 4 6

4 4 4 4 4 6 4 6

4 4 6 4 6 6 6 6

4 4 6 4 6 6 6 6

4 4 4 4 4 4 4 4

4 4 4 4 4 4 4 4

4 4 4 4 4 4 4 4

4 4 6 4 6 6 4 6

K8.2/

CP8

4 4 4 6 6 6 6 6

4 4 6 6 6 6 6 6

4 6 6 6 6 6 6 6

4 6 6 6 6 6 6 6

4 4 4 4 4 4 4 4

4 4 4 4 4 4 4 4

4 4 4 4 4 4 4 6

4 4 6 4 6 6 4 6

K10.2/

CP12

K10.2/

CP12

K12.2 KW122 KW152 KW153

K12.2 KW122 KW152 KW153

KLA12

× 1

KLA12

× 1

KLA12

× 2

KLA12

× 2

TD-001536-01-B

12

KS118

K8.2/

CP8

K10.2/

CP12

K12.2 KW122 KW152 KW153

KLA12

× 1

KLA12

× 2

SP-16X Ext. Pole

SP-26 Pole

SP-36 Pole

KS118 × 2

SP-16X Ext. Pole

SP-26 Pole

NOTE: Do not use the configurations marked by a red X (6)
unless the subwoofer or subwoofers are properly secured or
restrained (Figure 15) to prevent them leaning more than 10 degrees
in any direction.

4 4 4 4 4 4 4 4

4 4 4 4 4 4 4 4

4 4 4 4 4 6 4 6

K8.2/

CP8

4 4 4 4 4 4 4 6

4 4 4 4 4 6 4 6

K10.2/

CP12

K12.2 KW122 KW152 KW153

KLA12

× 1

KLA12

× 2

WARNING: Do not fly or suspend any KS Series subwoofer. It is not

intended or equipped for flying or suspension. Use only on a flat surface,
such as a floor or stage.

– Figure 15 –

13

TD-001536-01-B

Cooling

The KS Series Subwoofers contain an internal power amplifier that produces heat. Allow a minimum of 15 cm (6 inches)
clearance around the cabinet for convection cooling. Keep anything that might restrict airflow away from the rear of the
enclosure (i.e draperies, walls, etc.)

CAUTION: Do not operate the subwoofer with its amplifier module exposed to direct sunlight because
overheating will cause its protection circuitry to reduce its maximum output.
For full performance to specification keep the ambient temperature to below 50° C (122° F). KS Series
subwoofer enclosures are not weatherproof, so do not install them where they will be exposed to rain or other
water sources. Do not install outdoors without also protecting them from the elements.

AC Mains

See Figure 16.

AC Mains Disconnection

Use the power switch to turn the amplifier off. Unplug the AC mains cord from the power
source. The subwoofer has a V-LOCK latching IEC connector system; press the yellow
button on the IEC plug to release the cord from the socket. Grasp the plastic body of the
IEC connector to pull it out; do not pull on the cord.

Turning Your KS Series Subwoofers On

Connect the AC power cord to the IEC socket on the back of the amplifier. Make sure
it is fully inserted. The V-LOCK power cord has a special latching feature to prevent
unintentional detachment. The IEC cable plug and chassis socket are both blue so you
can easily identify the KS subwoofer cord. If the cord is lost or damaged, a standard
IEC power cord of 18 AWG or larger may be used in its place, though it will not have the
latching system. Replacement V-LOCK cords are available from QSC.

NOTE: Make sure that the AC power switch is OFF before connecting the AC power cord to the AC source.

Connect the AC power cord to the facility’s AC outlet. The amplifier modules are equipped with a universal power supply
that can use AC power voltages ranging from 100to240VAC at 50 – 60 Hz.

WARNING: Use only the power cable that is appropriate for your location.

– Figure 16 –

Power Switch

Use the rocker switch to apply AC mains power to the amplifier. When the amplifier is on, the blue POWER indicator LED
comes on.

Rear POWER Indicator LED

If the LED does not come on within 3 seconds after the amplifier module is turned on, verify that the power cord is
properly connected to both the subwoofer and the AC mains outlet. Make sure the outlet is functioning properly, too.

NOTE: If the power cord is good and the outlet is operating properly yet the subwoofer does not turn on, it
may require servicing. Contact QSC Technical Services Group.

TD-001536-01-B

14

System Power Sequencing

Proper power sequencing at turn on and turn off can help prevent audible thumps, clicks, and other noises in the system.
Always follow the rule that loudspeakers are last on and first off.

Turn-On Sequence:

1. Turn down the main faders (or other output level control) of the mixer (or other audio source) to minimum.

2. Turn on all the source devices and processors (CD players, mixers, instruments, etc.).

3. Turn on the KS Series subwoofers.

4. Turn on the top loudspeakers.

5. Bring up the faders or level controls on the mixer.

Turn-Off Sequence:

1. Turn off the top loudspeakers.

2. Turn off the KS Series subwoofers

3. Turn off all audio source devices and processors.

Block Diagram

A

Line In

Line Thru

B

Line In

Line Thru

Signal

Summing

– Figure 17 –



Gain

Delay

Preset

Contours

DSP

Limit

LF
Amp

15

TD-001536-01-B

Inputs and Outputs

1

TRS TS

The KS Series subwoofer amplifier module has two female
XLR/¼-inch combination inputs and two corresponding
pass-through male XLR outputs.

See Figure 18.

1. SIG LED (green) – indicates that a signal is present on
Input A or B or both. When it is not on, there is either no
signal or it is too low to detect.

2. CHANNEL A and B INPUTS – XLR – ¼-inch
combination connector for full-range line-level balanced
or unbalanced audio signals.

3. CHANNEL A and B PASS-THROUGH CONNECTORS
– Use these to daisy-chain full-range audio signals to
other loudspeakers or to other audioequipment.

4. LIMITER LED (red) – comes on when the module
activates its built-in protective limiter. The limiter prevents
damage to the amplifier and transducer—for example, if
the amplifier output signal level is too high or the module
is running too hot.

5. POWER LED (blue) – shows that the amplifier module is turned on.

6. GAIN knob – for adjusting sensitivity of inputs A and B, whose summed signals feed the power amplifier section.

– Figure 18 –

Balanced Inputs

PUSHPUSH

2

3

Connect the XLR plug as shown in Figure 19.

1. Shield (ground)

2. Positive

3. Negative

Connect the TRS (Tip-Ring-Sleeve) plug as shown in Figure 20. Do not use a TS (Tip­Sleeve) plug with a balanced signal.

1. Shield (ground)

2. Negative

3. Positive

– Figure 19 –

– Figure 20 –

Unbalanced Inputs

Connect the XLR plug as shown in Figure 21. (Jumper pins 1 and 3.)

– Figure 21 –

1. Shield (ground)

2. Positive

3. Negative

Connect the TRS or TS plug as shown in Figure 22.

1. Shield (ground)

2. Negative

3. Positive

TD-001536-01-B

– Figure 22 –

16

1

234

SettingsScene

Recall

Scenes

LED

Save

Scenes

Factory

Reset

Contrast

Firmware

Version

Crossover

Delay

4

Subwoofer Menu

The KS Series subwoofers feature a multi-function digital display
for control and selection of various subwoofer functions, including
scenes, crossover, and delay.

KS212C SUB

80 Hz

:

DELAY: 0 ms
SCENES: IN
SETTINGS

Display Introduction

1. Home Screen – Displays the model number and the main

5 6

functionalityheadings. A light background with black text
highlights the menu item selected.

2. Exit or “go back” button – press to return to the previous
screen or menu level.

3. Enter button – confirm a selected parameter or open the
selected menuitem.

4. Selector knob – move to another menu item, or change a

KS118

:

DELAY: 0 ms
DEEP:
CARDIOID:

80 Hz

OFF
OFF

selected parameter.

5. Left column displays the parameter name.

5 6

6. Right column displays the current state of the parameter.

Navigation Example

To set delay—for example, to configure a time-aligned satellite loudspeaker supplementing the main audio system:

1. Turn the knob (4) clockwise to select DELAY.

2. Press the Enter button (3) to access the DELAY submenu.

3. With the knob, set the desired amount of delay (displayed in ms, feet and meters simultaneously).

4. Press the Enter button to confirm the setting and return to the main menu.

KS112 and KS212C

1

23

KS118

Menu Map

KS112 and
KS212C

KS118

Crossover

Delay

Cardioid

SettingsDEEP™

Scenes

17

LED

Contrast

Factory

Reset

TD-001536-01-B

Menu Listing

CROSSOVER Set the crossover frequency

CROSSOVERS

80 Hz

CROSSOVERS

DELAY Set the amount of delay

DELAY

SCENE Save or recall a user-defined scene

100 Hz

DELAY

1.50 ms

1.69 FEET

0.51 METERS

The 80 Hz low-pass filter is optimized for the K.2 Series, CP Series, and future
loudspeakers
The 100 Hz low-pass filter is optimized for the legacy K, KLA, and KW
loudspeakers

Both crossover frequencies will time-align the subwoofer with a K.2 Series
loudspeaker pole-mounted over it, with both front edges parallel to each other.

0 – 100 milliseconds, 0 – 113 feet, 0 – 34 meters
All three units of measure display simultaneously.

SCENE MENU

SAVE SCENE

TO

USER 1 – 5

RECALL

SCENE

USER 1 – 5

SETTINGS Utility functions

SETTINGS

menu

LED

SCENE MENU

SAVE SCENES

RECALL SCENES

SAVE SCENE TO

USER 2

USER 3

USER 4

RECALL SCENE

USER 1

USER 2

USER 3

KS 212C 1.0.6.2844

LED

CONTRAST
FACTORY RESET

LED

FRONT AND REAR

REAR ONLY

FRONT ONLY

BACK

LOAD

With the knob, select the desired function. SAVE SCENES is for storing all
the current DSP settings into any one of five slots. RECALL SCENES is for
configuring the subwoofer with all the DSP settings that have been saved to
one of the scenes.

To save the current DSP settings as a scene, select which of the five available
slots you wish to use. Select from User 1 through User 5, then press the Enter
button.

The saved scene remains active, and a triangle appears next it.

A triangle next to the scene name indicates that it is active. To recall a different
scene, select the one you want. Press the Enter button to load its settings and
make it the new active scene.

This displays the model number and firmware version (these cannot be edited).
The available selections are LED, CONTRAST, and FACTORY RESET.
Select the one you want and press the Enter button.

Selects which combination of front and rear power indicator LEDs to use. Press
Enter to put your selection in effect.

CONTRAST

FACTORY

RESET

DEEP KS118 only

OFF

ON

TD-001536-01-B

CONTRAST

LEVEL 8

TEST TEXT

FACTORY RESET

USER PRESETS AND
SETTINGS WILL BE
SET TO DEFAULT

CONTINUE?

DEEP

OFF
ON

Adjusts the contrast of the LCD screen. Contrast settings are 0 through 15; the
default is 8. The screen changes as you adjust so you can see what the result
will be. Press Enter to put your selection in effect.

Resets all parameters to the factory default settings. To proceed, press Enter;
to cancel, press Go Back.
CAUTION: this also clears all the user scenes; there is no way to recover the

NO

scenes or undo the clearing.

YES

OFF uses the normal subwoofer response. ON boosts the low-frequency
extension below 60Hz but decreases sensitivity by 3dB to maintain headroom.

18

CARDIOID KS118 only

OFF

FORWARD

REAR

CARDIOID

OFF
FORWARD
REAR

KS112 Dimensions

24 5 in.

622 mm

OFF turns off the processing for cardioid operation, so the subwoofer performs
like a normal direct-radiating enclosure with an omnidirectional pattern.
Select FORWARD on any subwoofer that faces toward the audience.
Select REAR on any subwoofer that faces away from the audience.
Press Enter to put your selection in effect.

2KW ACTIVE SUBWOOFER

24 25 in.

616 mm

15 5 in.

394 mm

PUSH

PUSH

19

TD-001536-01-B

KS212C Dimensions

24 5 in.

622 mm

33 5 in.

851 mm

15 5 in.

394 mm

TD-001536-01-B

20

KS118 Dimensions

20.5 in

520 mm

30.9 in

785 mm

25.2 in

640 mm

21

TD-001536-01-B

Specifications

KS112 KS212C KS118

Configuration 6th-order bandpass subwoofer Dual 6th-order bandpass cardioid

LF Transducer 12-inch (305 mm) cone 2 × 12-inch (305 mm) cone 18-inch (457 mm) cone

Frequency Response
(-6dB)

Frequency Range
(-10dB)

Nominal Coverage Angle Omnidirectional 180˚ Cardioid (15 dB rear rejection @

Maximum SPL 128 dB @ 1 m (peak) 132 dB @ 1 m (peak) 136dB @ 1m (peak)

Amplifier Class D

Cooling Low-noise variable speed fan Low-noise variable speed fan Low-noise variable speed fan

Controls Power switch

Indicators 2 × Power LED (front and rear)

Connectors 2 × female locking XLR / ¼-in combo

AC Power Input Universal power supply 100 – 240

AC Power Consumption
(@ 1/8th of full power)

Enclosure Details

Enclosure
Color
Grille

Dimensions (H × W × D):
(Including casters)

Net Weight: 28.4 kg (62.6 lb) 40.1 kg (88.5 lb) 47 kg (104 lb)

Shipping Weight: 34.5 kg (76 lb) 48.5 kg (107 lb) 56.5 kg (124.5 lb)

Regulatory: CE, WEEE, UL, China RoHS, RoHS II,

Included Accessories: 4 × low-noise heavy-duty casters 4 × low-noise heavy-duty casters

Optional Accessories: KS112-CVR cover, KS-LOC lock-out

41–108 Hz 44–104 Hz 41–98Hz

38–121 Hz 39–118 Hz 35–111Hz

2000 W (peak)

Gain control
Rotary encoder
Two selection buttons

Signal LED
Limiter active LED

2 × male XLR (loop-thru output)
Locking IEC power connector

VAC, 50 – 60 Hz

100 VAC, 2.4 A / 120 VAC, 2.0 A / 240
VAC, 1.3 A

15 mm birch plywood
Black (RAL 9011)
Internal woofer cover

622 × 394 × 616 mm

24.5 × 15.5 × 24.25 inches

FCC Class B

cover
16-inch SP-16X extension pole
26-inch SP-26 loudspeaker pole
36-inch SP-36 loudspeaker pole

subwoofer

70 Hz)

Class D
2 x 1800 W (peak)

Power switch
Gain control
Rotary encoder
Two selection buttons

2 × Power LED (front and rear)
Signal LED
Limiter active LED

2 × female locking XLR / ¼-in combo
2 × male XLR (loop-thru output)
Locking IEC power connector

Universal power supply 100 – 240
VAC, 50 – 60 Hz

100 VAC, 3.6 A / 120 VAC, 3.0 A / 240
VAC, 1.7 A

15 mm birch plywood
Black (RAL 9011)
Internal woofer cover

622 × 394 × 851 mm

24.5 × 15.5 × 33.5 inches

CE, WEEE, UL, China RoHS, RoHS II,
FCC Class B

35 mm M20 loudspeaker pole 915 mm
(36 in) long (SP-36)

KS212C-CVR cover, KS-LOC lock-out
cover

16-inch SP-16X extension pole
26-inch SP-26 loudspeaker pole

Direct-radiating ported subwoofer

Cardioid off: Omnidirectional
Cardioid on: Up to 15 dB rear rejection

@ 70 Hz when arrayed

Class D
3600 W (peak)

Power switch
Gain control
Rotary encoder
Two selection buttons

2 × Power LED (front and rear)
Signal LED
Limiter active LED

2 × female locking XLR / ¼-in combo
2 × male XLR (loop-thru output)
Locking IEC power connector

Universal power supply 100 – 240
VAC, 50 – 60 Hz

100 VAC, 3.6 A / 120 VAC, 3.0 A / 240
VAC, 1.7 A

18 mm birch plywood
Black (RAL 9011)
16-gauge powder coated perforated

steel

640 × 520 × 785mm

25.2 × 20.5 × 30.9inches

CE, WEEE, UL, China RoHS, RoHS II,
FCC Class B

4 × low-noise heavy-duty casters

KS118-CVR cover, KS-LOC lock-out
cover

16-inch SP-16X extension pole
26-inch SP-26 loudspeaker pole
36-inch SP-36 loudspeaker poles

NOTE: Specifications subject to change without notice.

TD-001536-01-B

22

Mailing Address:

®

QSC, LLC

1675 MacArthur Boulevard

Costa Mesa, CA 92626-1468 U.S.

Main Number: +1.714.754.6175

World Wide Web: www.qsc.com

Sales & Marketing:

Voice: +1.714.957.7100 or toll free (U.S. only)

800.854.4079

FAX: [phone]

E-mail: [e-mail]

QSC Technical Services

1675 MacArthur Blvd.

Costa Mesa, CA 92626 U.S.

Tel: [phone] (U.S. only)

Tel: [phone]

FAX: [phone]

[e-mail]

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