QSC KLA181 18inch Active Flying Subwoofer

  • 1,000 watt power module
  • 18″ vented subwoofer
  • High acoustic output (135 dB SPL peak)
  • Frequency range down to 33 Hz (-10 dB)
  • Extensive DSP further enhances and protects performance

$2,589.00 CAD

In stock

SKU: 684284058775 Category: Tags: , , Model Number: KLA181-B


About QSC KLA181 18inch Active Flying Subwoofer

The KLA Series brings the power and sophistication of a line array system into an easy-to-use product significantly redefining the line array product category. With its simple Lift, Click and Play approach, KLA can be deployed in a fraction of the time required by comparable line array products. This fixed arcuate, active line array system is ideal for a wide range of portable and permanently installed applications ranging from live entertainment to houses of worship or other venues where a line array system is desired.

KLA Power Module

The KLA Series is comprised of two models: the KLA12 12-inch, 2-way loudspeaker and the KLA181 18-inch subwoofer. The KLA12 features a highly efficient 500 W x 500 W power amp module and the QSC KLA181 18inch active flying subwoofer offers the same highly efficient power amp module in a 1000 W configuration. This efficient design enables up to five KLA models (any combination of KLA12 and QSC KLA181 18inch active flying subwoofer) to be driven off of a single 15 amp/120V (8A / 230V) electrical circuit. KLA loudspeakers incorporate QSC’s DEEP™ DSP algorithm, providing extended bass response by actively managing potentially damaging low-frequency transients, and GuardRail™ circuitry protection which prevents the amplifier module from unnatural and destructive clipping. As an energy saving feature, the Auto Standby mode automatically engages after five minutes of inactivity but upon resumption of audio signal, the power module on the KLA will awaken instantly for immediate output.

In an installed application, multiple KLA Series loudspeakers can be “daisy-chained” for total gain control from a single remote pot wired to the on-board Phoenix-style connector. Additional power module characteristics on KLA include a balanced, line-level XLR input in parallel with an XLR “Thru” connector, powerCON® In and Thru connectors, Attenuation Control and LED indicators for Signal and Limit, as well as discrete LED indicators for Power/Standby status.


In addition to DEEP™ DSP algorithm, GuardRail™, Auto Standby, balanced line-level XLR input with an XLR “Thru” connector, Attenuation Control and LED indicators, the KLA181 subwoofer also includes a polarity switch.


QSC KLA181 18inch Active Flying Subwoofer Features:

  • 1,000 watt power module
  • 18″ vented subwoofer
  • High acoustic output (135 dB SPL peak)
  • Frequency range down to 33 Hz (-10 dB)
  • Extensive DSP further enhances and protects performance
  • powerCON® Input and Thru connections
  • Threaded pole receptacle for free-standing applications (black models only)
  • Suspension made possible via M10 fittings or KLA12AF Array Frame
  • Integrated threaded pole mount supports up to two KLA12 enclosures (black models only)


QSC KLA181 18inch Active Flying Subwoofer Specifications:

Configuration18″ subwoofer
High Frequency
Low Frequency
18″ cone transducer
Frequency Response (-6 dB)38 Hz
Frequency Range (-10 dB)33 Hz
Nominal Coverage
Maximum SPL (1 meter)135 dB peak
Power Output1000 W Class D continuous
Input ImpedanceXLR: 40 kΩ balanced / 20 kΩ unbalanced
ControlsPower, Attenuation, LF Mode (Normal/DEEP™), Polarity (Normal/Reverse), Front LED (Pwr/Limit/Off)
IndicatorsPower, Signal, Standby, Limit
ConnectorsBalanced female XLR line level input, Balanced male XLR full range line level out, Remote attenuation control, Locking powerCON power connector AC In, Locking powerCON® power connector AC Out
CoolingOn demand, 50 mm variable speed fan
Amplifier ProtectionThermal limiting, output overcurrent, overtemperature muting, GuardRail™
Transducer ProtectionThermal limiting, excursion limiting
AC Power InputUniversal power supply 100–240 VAC, 50 to 60 Hz
AC Power Consumption
(1/8 Power)
100 VAC, 2.3 A
120 VAC, 2.01 A
230 VAC, 1.13 A
MaterialPainted birch plywood
FinishBlack or white textured paint
GrilleBlack or white powder coated 16 gauge steel
Dimensions (HWD) inches21.6 × 23.1 × 25.7
Dimensions (HWD) mm547 x 586 x 633
Net Weight100 lb / 45.3 kg

Additional information

Weight121.0 lbs
Dimensions31.0 x 28.0 x 24.0 in


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