PreSonus AIR18S Active 18" Sound-Reinforcement Subwoofer

The PreSonus AIR18s is an active sound-reinforcement subwoofer designed to anchor the low end of both portable and permanently installed PA systems. At its core is an 18-inch woofer with a 3-inch voice coil, powered by a 1,200-watt Class D amplifier that delivers dynamic, responsive bass down to 35 Hz. The variable low-pass filter on the rear panel lets operators set the upper frequency cutoff precisely, ensuring smooth integration with whichever full-range loudspeakers are in the system. With a maximum SPL of 137 dB, the AIR18s has the output to fill mid-size venues, event spaces, and houses of worship with clean, well-defined low-frequency energy.

What sets the AIR18s apart from basic powered subs is its built-in DSP presets for cardioid subwoofer arrays. Ground-stacked and end-fire configurations can be engaged at the push of a button, giving sound engineers tighter directional control over bass without needing external processors. Connectivity is straightforward: two XLR/¼-inch combo inputs with parallel direct outputs make daisy-chaining simple, while a 1/8-inch input accommodates smartphones and tablets for background music or quick sound checks. Whether deployed as a standalone sub for a mobile rig or stacked in multiples for larger events, the AIR18s is built to deliver consistent, powerful low-end reinforcement.