S 18i

Installation high performance compact 18″ subwoofer

TransducersLF : 1 x 18″
SPL peak / 1m (measured)134 dB
Weight38.8kg / 85.53lbs
RiggingM8 threated insert
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S 18i is a compact, high-performance installation subwoofer, providing the perfect companion to the AUDIOFOCUS VENU, FR-X, or ARES 8 series in standalone, stacked, or flown configurations.

The subwoofer houses a long excursion 18″ neodymium driver and combines front diffusion, bass reflex, and transmission line design for ultimate efficiency and performance.

S 18i is built with pride in Belgium and coated in tough, weather-resistant polyurea to safeguard your investment. The cabinet front is protected by a rigid metal grill, backed by acoustically transparent foam. Its compact design makes S 18i easy to transport and install.

S 18i can be quickly deployed in any configuration, including cardioid and end-fire, when used with AUDIOFOCUS A Series amplifiers. Armonia presets are also available for Powersoft amplifiers.


  • Powerful bass-reflex T-line design
  • Fixed installation applications
  • Passive
  • Threaded inserts

Technical specifications

DescriptionHigh-power subwoofer
Transducers LF: 1 x 18″
Frequency range (-6dB)38Hz-100Hz
SPL max (1)134 dB
ProcessingDedicated AUDIOFOCUS and Armonia/Powersoft omni and cardioid presets
RiggingM8 threated insert
Connectors2 × 4-point speakON
Nominal Impedance8ohm
Watt AES/peak1200/4800W
Dimensions (H x W x D)510 x 650 x 560 mm
20.07 x 25.59 x 22.04 inches
Weight38.8kg / 85.53lbs
FinishHighly resistant polyurea coating

CabinetHigh grade birch plywood

(1) Peak level measured at 1 m under free field conditions using pink noise with crest factor 5

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