Dual 18" High Power Subwoofer

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The SRX728S is a high power subwoofer system containing two 2268H neodymium magnet, patented* Differential Drive, 18" woofers in a front-loaded, vented enclosure. The enclosure is designed to present a minimum frontal area. The system offers complete 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. By relocating an internal connector, it is also possible to drive each woofer discretely from a separate amplifier channel.

The enclosure is constructed of top quality birch plywood and coated in JBL's rugged DuraFlex finish. Each woofer is housed in an isolated chamber and the enclosure is heavily braced to maximize low-frequency performance. The attractive CNCmachined, 16-gauge steel grille is internally lined with acoustically transparent foam to provide additional driver protection and give a very professional appearance.


  • Live performance venues

  • Mobile and fixed DJ systems

  • Sound system rental


  • Dual 18 inch, 2268H Differential Drive woofers for extended lowfrequency output

  • Large vent area for reduced distortion


  • Frequency Range (-10 dB): 27 Hz - 220 Hz

  • Frequency Response (+/-3 dB): 33 Hz - 220 Hz

  • Input Connection Modes: Switchable, +1/-1 or +2/-2

  • Internally selectable, Parallel or Discrete

  • Recommended Crossover Frequencies:80 Hz, 24 dB / octave HPF80 Hz, 24 dB / octave LPF

  • Power Rating (Continuous / Program / Peak): Parallel: 1600 W / 3200 W / 6400 W

  • Maximum SPL: 136 dB SPL peak

  • Sensitivity (1w @ 1m): 98 dB SPL

  • LF Driver: 2 x JBL 2268H 457 mm (18 in) Differential Drive woofer with neodymium-magnet and dual voice-coils

  • Nominal Impedance:Parallel: 4 ohmsDiscrete: 8 ohms x 2

  • Active Tunings: dbx DriveRack, all models. Settings available at www.jblpro.com

  • Enclosure: Rectangular, 18 mm, 13-ply birch plywood

  • Finish: Black DuraFlex finish

  • Grille: Powder coated, black, 16-gauge perforated steel with acoustical transparent charcoal foam backing. Removable JBL badge and punched JBL logo.

  • Input Connectors: Neutrik Speakon NL-4 (x2)

  • Dimensions (H x W x D): 602 mm x 1067 mm x 838 mm (23.7 in x 42 in x 33 in)

  • Net Weight: 76 kg (166.5 lb)

  • Optional Accessories: SRX728S-CVR: Pull-over padded cover

JBL SRX728S Documents
User GuideSpec Sheet
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