Tectonic LS-218 Subwoofer

Regardless of whether your music content is Live Classical, or Canned DubStep, the LS-218 delivers power that you can feel, and does so in a very musical way. It features an advanced port design optimizing chamber size, port velocity and acoustic loading of the dual 18” woofers. The enclosure has superior sensitivity, power handling and provides increased gain over typical front-loaded designs. The cabinets were designed for easy stacking and for use as a cardioid pattern acoustic solution where rear and side-firing low frequency pattern control is desired.


  • 2 18” Drivers feature 4-inch diameter voice coils and advanced vented neodymium motors
  • Transducer design provides lighter weight and increased efficiency
  • Enclosure constructed of 19-ply Baltic Birch; finished in wear-resistant black polymer coating
  • 8 rigging points w/8mm quick pins provided to attach flyware, flybars and additional cabinets
  • Each 8 ohm driver can accommodate program power of 1600 watts and peak power of 2400 watts
  • Rigging Bars, Caster Carts and Soft Covers available separately
  • Front and rear Speakon NL4s provided (for use in cardioid arrangements)


  • Woofer Size : 18.00” (457mm)
  • Voice Coil Diameter: 4.00” (100mm)
  • Magnet Type: Neodymium

Construction Features

  • Hardware/Flyware: (8) Custom Pin Inserts
  • Dimensions (inch): 51.8” W x 20.1” H x 47.3” D
  • Dimensions (mm): 1300 W x 510 H x 1200 D
  • Weight (lbs/kg): 270 lbs (123 Kg)

Performance Specifications

  • Frequency Response: 28Hz – 120Hz (-3dB)
22Hz – 160Hz (-10dB)
  • One LS Cabinet
    • Sensitivity: 101dB @ 1W/1 Meter
    • Max SPL Long-term: 140dB
    • Max SPL Peak: 143dB
  • Two LS Cabinets
    ◦ Sensitivity: 104dB 1W/1 Meter
    ◦ Max SPL Long-term: 143dB
    ◦ Max SPL Peak: 146dB

Settings & Impedance

  • Crossover Point: 80Hz – 120Hz
  • Nominal Impedance: 2 x 8 Ohms 
  • Continuous Power Rating: 1200W RMS
 (ea 8 Ohms)
  • Program/Peak Power: 2400W/3600W
 (ea 8 Ohms)
  • Recommended Amplification: 3200W @ 8 Ohms ea


  • WOOFER SIZE18.00” (457.2mm)
  • VOICE COIL DIAMETER4.00” (101.6mm)
  • MAGNET TYPENeodymium


LS-218 Spec Sheet