HST-18 mkIII 18″ Subwoofer


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

Please specify Dual 1 Ohm or Dual 2 Ohm coil configuration in the notes section when you order.

To use a credit/debit card to place your order please call us during normal business hours at 731-439-9629.

These subwoofers are hand-built in North Carolina.

Build time can be up to fourteen business days once your order is placed.



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. Our new driver 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 a modified motor which allows for 40 mm of one-way linear travel. Multiple faraday rings inside the 250 mm diameter motor improve impulse response over other designs.

  • Foam surround
  • 3″ diameter bi-filar copper voice coil
  • 2000 watts RMS power handling
  • Internal Faraday ring
  • Chrome motor finish
  • Cast aluminum basket
  • 10″ nomex spider with dual flat sewn-on lead wires
  • Large 4 AWG speaker terminals
  • 40 mm one-way linear Xmax
  • Over 100 mm of cone travel possible
  • Cutout: 423.9 mm (16.69 inches)
  • Outer Diameter: 467.86 mm (18.42 inches)
  • Mounting depth: 302.26 mm (11.9 inches)
  • Mounting flange to top of surround: 63.5 mm (2.5 inches)
  • Sealed enclosure size of 3.7 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 driver.
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) 40 mm
RMS Power Handling 2000