KS Series ® User Manual KS112 – 2000 watt Active Subwoofer KS118 – 3600 watt Active Subwoofer KS212C – 3600 watt Active Cardioid Subwoofer KS112 KS118 KS212C TD-001536-01-C *TD-001536-01*
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.
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.
Warranty For a copy of the QSC limited warranty visit the QSC website at www.qsc.
KS112 / KS212C Features 1 Top 1 Bottom 2 Horizontal Top 7 7 3 4 8 5 Front Horizontal Bottom Rear 6 3 PUSH PUSH 10 9 – Figure 1 – 1. 2. 3. 4. 5. 6. 7. 8. Alignment cups for stacking Four low-noise, heavy-duty casters Amplifier protection rails M20 threaded socket for 35 mm loudspeaker pole Slip-resistant feet - four on the bottom Slip-resistant feet - four on the side Cast aluminum handles M20 threaded socket for 35 mm loudspeaker pole 9. Front power LED 10.
KS118 Features 1 2 Left Side Top Bottom 3 7 4 5 5 6 Right Side Front Rear 3 KS118 A 7 8 – Figure 2 – 1. 2. 3. 4. 5. 6. 7. Alignment cups for stacking Four low-noise, heavy-duty casters Amplifier protection rails M20 threaded socket for 35 mm loudspeaker pole Slip-resistant feet - four on the bottom Slip-resistant feet - four on the side Cast aluminum handles TD-001536-01-C 8. Front power LED 9.
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.
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.
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.
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.
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 A B FRONT VIEW (as seen from audience) KS118 Cardioid > Rear Floor – Figure 10 – Cardioid > Forward 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.
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.
K8.2/ CP8 K10.2/ CP12 K12.2 KW122 KW152 KW153 KLA12 ×1 KLA12 ×2 SP-16X Ext. Pole 4 4 4 4 4 4 4 4 SP-26 Pole 4 4 4 4 4 4 4 4 SP-36 Pole 4 4 4 4 4 6 4 6 K8.2/ CP8 K10.2/ CP12 K12.2 KW122 KW152 KW153 KLA12 ×1 KLA12 ×2 SP-16X Ext.
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.
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. 2. 3. 4. 5. Turn down the main faders (or other output level control) of the mixer (or other audio source) to minimum. Turn on all the source devices and processors (CD players, mixers, instruments, etc.). Turn on the KS Series subwoofers. Turn on the top loudspeakers.
Inputs and Outputs 1 2 The KS Series subwoofer amplifier module has two female XLR / ¼-inch combination inputs and two corresponding pass-through male XLR outputs. PUSH PUSH 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.
Subwoofer Menu 1 The KS Series subwoofers feature a multi-function digital display for control and selection of various subwoofer functions, including scenes, crossover, and delay. Display Introduction 1. Home Screen – Displays the model number and the main 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.
Menu Listing CROSSOVER Set the crossover frequency 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 CROSSOVERS CROSSOVERS 80 Hz 100 Hz 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.
CARDIOID KS118 only 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. CARDIOID OFF FORWARD REAR OFF FORWARD REAR 24.5 in 622 mm KS112 Dimensions 24.25 in 616 mm 15.
24.5 in 622 mm KS212C Dimensions 33.5 in 851 mm PUSH TD-001536-01-C 15.
KS118 Dimensions 25.2 in 640 mm 30.9 in 785 mm 20.
Specifications KS112 KS212C KS118 Configuration 6th-order bandpass subwoofer Dual 6th-order bandpass cardioid subwoofer Direct-radiating ported subwoofer LF Transducer 12-inch (305 mm) cone 2 × 12-inch (305 mm) cone 18-inch (457 mm) cone Frequency Response (-6 dB) 41–108 Hz 44–104 Hz 41–98 Hz Frequency Range (-10 dB) 38–121 Hz 39–118 Hz 35–111 Hz Nominal Coverage Angle Omnidirectional 180˚ Cardioid (15 dB rear rejection @ 70 Hz) Cardioid off: Omnidirectional Cardioid on: Up to 15 dB re
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