The L’Acoustics SB28 passive subwoofer features dual 18-inch high-excursion transducers. Housed in a bass-reflex tuned enclosure featuring laminar vents, the SB28 enhances low-frequency efficiency and minimizes turbulence for deeper, more accurate bass. The subwoofer can be set to achieve either omnidirectional or cardioid directivity patterns to deploy in various acoustic needs.