Designed to complement any full-range PA speaker and the perfect companion to the PreSonus® AIR10, AIR12 and AIR15, the AIR18s subwoofer packs a punch for powerful, clear and accurate bass. With an 18-inch low-frequency driver powered by 1200 watts of Class D power, it delivers plenty of detail in the lower end of the spectrum - down to 30 Hz. Yet it's portable and well-suited for mobile applications as well as fixed systems. Because each venue has unique acoustics and each application has different sound reinforcement requirements, we equipped AIR subwoofers with easy-to-use controls and signal processing presets. Set your subwoofers for normal front-of-house use or get even bigger bass with the Mo' Bass preset. Set them to work as a set. Reverse the phase, use the low-pass filter to set a cutoff frequency, adjust the overall output level of the power amplifier, and even choose to turn off the grille LED for fixed installations or have it light up only when the limiter protection activates-all at the touch of a button.