1250W 18" Self-Powered Subwoofer


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The Action 218A is a powered subwoofer system designed to provide outstanding performance in terms of output power, bandwidth extension and distortion. The Action 218A incorporates the 18H4 loudspeaker equipped with 4" voice coils, offering an excellent power handling capacity, reduced distortion and power compression.

The Action 218A incorporates a new high power (2500 W peak) amplifier design providing ample headroom and accuracy. The amplifier uses the latest Class D design. The subwoofer is designed to be stacked vertically, reducing the units footprint and allowing for more "on-stage"space.


  • Powered high performance subwoofer system
  • 2500 W peak Class "D" amplifier
  • Two 18H4 loudspeakers with 4" voice coils
  • Front loaded bass-reflex configuration


  • Nominal LF Amplifier Power 2500 W peak, 1250 W continuous
  • Frequency Range (-10 dB) 35 Hz - 160 Hz
  • Rated Peak SPL at 1 m 139 dB
  • Internal Crossover Variable LPF 100 Hz-160 Hz
  • Connectors:
      -  INPUT: 2 x Female XLR
      -  LOOP THRU: 2 x Male XLR
      -  AC INPUT: PowerCon NAC 3 FCA
      -  AC OUTPUT: Powercon NAC 3 FCB
  • AC Requirements:
      -  115 V, 5.4 A, 50 Hz/60 Hz
      -  230 V, 2.7 A, 50 Hz/60 Hz
  • Enclosure Material: Birch Plywood
  • Color/Finish: Black/Paint
  • Dimensions (H x W x D):
      -  106.7 x 54 x 67 cm
      -  42 x 21.3 x 26.4 in
  • Weight 63 kg (138.6 lb)

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Full Compass is a national leader in Professional Audio, Professional Video, A/V, Lighting and Musical Instrument sales. Since 1977, our goal has been to provide the best possible value with exceptional customer service. We offer over 700 top equipment brands including, Shure, Yamaha, Panasonic, Sony, JBL, Sennheiser, Canon, QSC, Audio-Technica, Crown and much more. We also provide services such as computer systems integration, lighting design, and rentals (rentals available in Wisconsin only). Full Compass is an authorized service center and parts distributor for most of the major manufacturers we carry.