QSC KS212 C, KS112 User manual

KS Series

User Manual

KS212C – 3600 watt Active Cardioid Subwoofer

KS112 – 2000 watt Active Subwoofer

KS112

®

TD-001536-01-A

*TD-001536-01*

KS212C

EXPLANATION OF SYMBOLS

The term “WARNING!” indicates instructions regarding personal safety. If the instructions are not followed the result may
be bodily injury or death.

The term “CAUTION!” indicates instructions regarding possible damage to physical equipment. If these instructions are
not followed, it may result in damage to the equipment that may not be covered under the warranty.

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

The term “NOTE” is used to indicate additional useful information.

NOTE: The intent of the lightning flash with arrowhead symbol in a triangle is to alert the user to the presence
of un-insulated “dangerous” voltage within the product’s enclosure that may be of sufficient magnitude to
constitute a risk of electric shock to humans.

NOTE: The intent of the exclamation point within an equilateral triangle is to alert the user to the presence of
important safety, and 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.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Clean only with a dry cloth.

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

8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers)
that produce heat.

9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one
wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the
third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.

10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point
where they exit from theapparatus.

11. Only use attachments/accessories specified by the manufacturer.

12. Unplug this apparatus during lightning storms or when unused for long periods of time.

13. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any
way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus,
the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

14. The appliance coupler, or the AC Mains plug, is the AC mains disconnect device and shall remain readily operable
after installation.

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15. Adhere to all applicable, local codes.

16. To prevent electrical shock, the power cord shall be connected to a mains socket outlet with a protective earthing connection.

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

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

19. Do not unplug the unit by pulling on the cord, use the plug.

20. Do not submerge the apparatus in water or liquids.

21. Keep ventilation opening free of dust or

other matter.

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 a danger of subsequent damage to the apparatus, injuries to persons
and/or the creation of additional safety hazards, all maintenance or repair work on the apparatus should be performed only
by a QSC authorized service station or an authorized QSC International Distributor. QSC is not responsible for any injury,
harm or related damages arising from any failure of the customer, owner or user of the apparatus 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.

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RoHS Statements

These products are in compliance with European Directive 2011/65/EU – Restriction of Hazardous Substances (RoHS).

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 KS212C and KS112 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)

Warranty

For a copy of the QSC Limited Warranty, visit the QSC website at www.qsc.com

Package Contents

KS212C or KS112
Subwoofer

QSC Limited
Warranty
TD-000453

35 mm, M20, 915
mm (36 in) long
Loudspeaker Pole
Included with the
KS212C only.

1

Locking
AC Power cord

1

Quick Start Guide
TD-000499 – KS212C or
TD-001518 – KS112

1

1

1

2

White QSC Logo

1

Powered Loudspeaker
Safety Sheet
TD-000337

TD-001536-01-A

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KS212C / KS112 Features

1

2

3

4

5

6

11

1

Top Bottom

Horizontal Top

7

8

9

Horizontal Bottom

Front

Rear

7

3

1. Rubber-feet stacking-alignment cups

2. Four low-noise, heavy-duty casters

3. Amplifier protection rails – protects the amplifier when
the unit is rolled off, for example, a curb.

4. M20 threaded socket for 35 mm speaker pole

5. Slip-resistant feet - four on the bottom,

10

— Figure 1 —

7. Cast aluminum handles

8. M20 threaded socket for 35 mm speaker pole

9. 18 mm birch plywood for KS212C

10. Front power LED

11. Amplifier power module and controls

15 mm birch plywood for KS112

6. Slip-resistant feet - four on the side

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About the KS212C Cardioid Subwoofer

Subwoofer Energy Dispersion

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

CardioidTypical

Rear

Rear

1

-

d

5

B

Front

— Figure 2 —

Front

Low frequency energy, from subwoofers, is effectively omnidirectional in nature (equally loud in all directions). This is
because low frequency wavelengths are much longer than the dimensions of the subwoofer enclosure, and therefore
“wrap” around it. A cardioid subwoofer arrangement employs both front- and rear-firing woofers, and through some
clever use of spacing, delay, and polarity, a cancellation of rear-firing energy is created behind the subwoofer, while also
enhancing the forward-firing energy.

The KS212C is powered by a Dual 1800 W Class D amplifier, processed with QSC’s latest DSP technology, and
incorporates dual, 12-inch, long-excursion drivers that are each arranged in a sixth-order bandpass chamber. Through
complex processing, 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. This results in a
net 15 dB higher output at the front of the cabinet than at the rear. To put this into perspective, 15 dB is the difference
between 30 watts and 1000 watts.

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