Add epic low end to your live rig, with a KLA181 subwoofer from QSC. This hard-hitting 1,000-watt active subwoofer features QSC's amazing DEEP DSP algorithm, which smoothly shapes bass frequencies for maximum impact. GuardRail protection allows the KLA181 to deliver maximum peak power, without overloading. That lets you keep the crowd amped up, without risking show-stopping shutdowns. The KLA181 sub also features both a balanced line-level XLR though jack and a locking AC power through jack - perfect for daisy chaining up to a set of KLA12 top boxes pole-mounted overhead.


  • General

    • Configuration:  18" subwoofer
    • Transducers:  Low Frequency:  18" cone transducer
    • Frequency Response (-6 dB):  38 Hz
    • Frequency Range (-10 dB):  33 Hz
    • Maximum SPL (1 meter):  135 dB peak


    • Power Output:  1000 W Class D continuous
    • Input Impedance:  XLR: 40 kΩ balanced / 20 kΩ unbalanced
    • Controls:  Power, Attenuation, LF Mode (Normal/DEEP™), Polarity (Normal/Reverse), Front LED (Pwr/Limit/Off)
    • Indicators:  Power, Signal, Standby, Limit
    • 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


    • Balanced 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

    Physical & Dimensions

    • Material:  Painted birch plywood
    • Finish:  Black 
    • Grille:   Black powder coated 16 gauge steel
    • Dimensions (HWD):  547 x 586 x 633mm
    • Weight:  45.3 kg