HST-18 mkIII 18″ Subwoofer


Please select voice-coil configuration, either Dual 1 ohm or Dual 2 ohm voice coils.

Flat $5 shipping in the lower 48 contiguous United States.

These subwoofers are hand-built in North Carolina.

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Our new HST-18 mkIII is the result of years of pursuing perfection in the lower octaves of audio reproduction. Playing extremely deep and loud with the ability to sound superb in a very small enclosure is what the HST18 mkIII is all about. A single HST-18 mkIII will shake your theater room floor, walls, and couch with its monumental output capability. And if you throw on your favorite music selection it can be as cool as laid back as required. But let’s be serious here – you’re on this web page to read about our highest capability, longest stroke, king of Xmax, 18″ subwoofer that will smack and shake your entire body with its high-bandwidth high-SPL output.

Our HST-18 mkIII subwoofer reaches a 0.707 alignment in 3.7 ft^3 sealed with a vented alignment suggestion of 8 ft^3 tuned to 18 Hz. For extremely deep reproduction below 20 Hz our new driver has improved modifications which allow for a staggering 38 mm of Klippel verified one-way linear travel. Multiple faraday rings inside the 250 mm diameter motor improve impulse response for the best bass possible.

Additional information

Voice-coil Configuration

Dual 1 ohm, Dual 2 ohm

  • Foam surround
  • 3″ diameter bi-filar copper voice coil
  • 2000 watts RMS power handling
  • 3 Internal Faraday rings
  • Chrome motor finish
  • Cast aluminum basket
  • 10″ nomex spider with dual flat sewn-on lead wires
  • Large 4 AWG speaker terminals
  • 38 mm one-way linear Xmax
  • Over 100 mm of cone travel possible
  • Cutout: 425.0 mm (16.73 inches)
  • Outer Diameter: 462.0 mm (18.18 inches)
  • Mounting depth: 355.6 mm (14.0 inches)
  • Mounting flange to top of surround: 63.5 mm (2.5 inches)
  • Sealed enclosure size of 4.0 ft^3
  • Ported enclosure size of 8 ft^3 tuned to 18 Hz. Use a port, or ports, with at least 50 in^2 of port surface area per port(s).

RMS Power Handling2000

HST18 mkII Dual 2 ohm voice coils
Re 3.4 ohms
Fs 14.8 Hz
Qes 0.38
Qms 5.95
Qts 0.36
Le 3.4 mH
Sd 117839 mm^2 (182.65 in^2)
Vas 284 L
BL 25.6
Mms 792 g
Cms 144
Sensitivity (2.83V/1m) 89.2 db
Xmax (1-way) 38 mm