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QSC KW181 - 18" 1000 W Subwoofer System

Availability: In Stock

Regular Price: $1,749.99

Special Price: $1,499.99

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Regular Price: $1,749.99

Special Price: $1,499.99

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-  18" inches single Subwoofer
- 1000 W Class D power module
- Birch plywood enclosure and steel grille
- Comes with a front LED 
- Slip-resistant feet and feet cups for stacking

K Family active loudspeakers

Converging QSC's expertise in loudspeaker, amplifier, and digital signal processing technologies, QSC has created a spectrum of active loudspeakers designed with one common goal – accurate acoustical performance for the widest selection of applications. Ranging from a compact and potent eight-inch, two-way utility loudspeaker to a fixed-arcuate line array system, all K Family models feature common power modules, DSP and performance characteristics - irrespective of their size or configuration. Models are differentiated primarily by coverage angle, bass extension, woofer diameter and enclosure size. With the K Family there is no “good, better, best” – only “best, best, best”.


  • 18” subwoofer
  • Maximum SPL 135 dB peak
  • 1000 watt Class D continuous 
  • power 
  • Tour-grade 16 gauge steel grilles
  • Rugged, texture-painted birch enclosures
  • Threaded pole socket
  • Speaker mounting pole included (35 mm diameter, 36 inches (91 cm) long, M20 thread.)
  • Comfortable ergonomic handles
Configuration 18-inch subwoofer
Transducer 18-inch cone transducer
Frequency Response (-6 dB) 40 Hz to 112 Hz
Frequency Range (-10 dB) 37 Hz to 129 Hz
Maximum SPL1 135 dB peak
Power Output2 1000 W Class D continuous 
2000 W peak
Input Impedance XLR / ¼⁻ᶦⁿᶜʰ: 38 kΩ balanced / 19 kΩ unbalanced
Controls Power, Gain, LF Mode (Normal/DEEP™), Polarity (Normal/Reverse), Front LED (On/Off/Limit)
Indicators Power, Signal, Standby, Limit
Connectors Dual balanced female XLR/¼⁻ᶦⁿᶜʰ line level input, Dual Balanced male XLR full range line level out, Remote gain control, Locking IEC power connector
Cooling On demand, 50 mm variable speed fan
Amplifier Protection Thermal limiting, output overcurrent, overtemperature muting, GuardRail™
Transducer Protection Thermal limiting, excursion limiting
AC Power Input Universal 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
Material 15 mm painted birch plywood
Finish Black textured paint
Grille Rugged Powder-Coated Steel Grille
Dimensions (HWD) inches 20.1 x 23.4 x 29.9 with casters
Dimensions (HWD) mm 510 × 595 × 761 with casters
Net Weight 83 lb / 37.6 kg
Available Accessories KW181 cover
what's included
  • QSC KW181 Subwoofer
  • Locking NEMA 5-15 power cable
  • Locking CEE 7/4 power cable
  • Euro-style Connector Plug, 3-pin
  • Wiring hookup diagram
  • M20 threaded loudspeaker pole
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