The STX818S Passive 18" Bass Reflex Subwoofer by JBL is a compact, high-power low frequency system capable of handling 1,000W of continuous power. It's rated at 2,000W of program power and 4,000W of peak handling. The 18" Super Vented Gap Cooled woofer is front-loaded into the vented enclosure. The system offers input connection flexibility for compatibility with a variety of cabling schemes. A recessed, external switch allows selection of either contacts +1/-1 or +2/-2.


The STX818S enclosure is constructed of top quality birch/poplar laminate plywood, coated in JBL's rugged DuraFlex finish and is heavily braced to maximize low-frequency performance. It is also equipped with a threaded, pole socket to mount speakers weighing up to 100 pounds. The threaded socket minimizes buzzing and rattling and assures that the pole will be secure and straight. The CNC-machined, 14-gauge steel grille is internally lined with acoustically transparent cloth to provide additional driver protection and give a professional appearance. The rear of the enclosure is fitted with T-nuts which may be used to attach the optional WK-4 caster kit.


$1,199.00 Regular Price
$699.00Sale Price
  • Active or Passive Passive
    System Type 18" bass-reflex subwoofer
    Frequency Range 35 to 250 Hz (-10 dB)
    Frequency Response 40 to 120 Hz ±3 dB
    Input Connection Type Switchable, +1/-1 or +2/-2
    Low Pass Crossover 80 Hz, 24 dB, octave LPF
    High-Pass Filter 30 Hz, 24 dB, octave HPF
    Power Handling 1,000W continuous
    2,000W program
    4,000W peak
    Maximum SPL 132 dB SPL peak
    Sensitivity 96 dB SPL (1W @ 1 m)
    Low Frequency Driver 1 x JBL 2242H 18" (457 mm) Super Vented Gap Cooled woofer
    Nominal Impedance
    Enclosure Tuning Designed for Crown amplifiers and dbx DriveRack
    Mounting Options Top mounted M20 threaded socket for optional SS4-BK pole
    Enclosure Rectangular, 0.71" (18 mm) 13-ply birch/poplar laminate plywood
    Handle or Carrying Type 4 side handles, bottom mounting points for optional casters
    Finish Black DuraFlex finish
    Grille Powder coated, black, 14-gauge perforated steel with acoustical transparent cloth backing
    Input Connectors 2 x Neutrik Speakon NL-4
    Dimensions (H x W x D) 22.0 x 22.4 x 28.3" (558 x 568 x 718 mm)
    Weight 100 lb (45 kg)
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