S 18a is a compact, high-performance self-powered touring subwoofer, providing the perfect companion to the AUDIOFOCUS VENU, FR-X, or ARES 8 series in standalone and stacked 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.

An advanced AUDIOFOCUS Class D amplifier module with integrated DSP and 4 versatile presets allows S 18a to be quickly deployed in any configuration, including cardioid and end-fire.

S 18a 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 and ergonomic handles make S 18a easy to transport and deploy.


40 kg
38 Hz - 100 Hz
8 Ohms
Radiation direct bass-reflex
Omni 360°
Pole Socket
Config cardio possible
Made in Belgium




Tech S18a

Technical Sheet S18a


A4M SCIO User Manual