The S-TL218SS is the rugged, outdoor version of our popular TL218SS Super Sub design. It complements our outdoor line arrays, delivering 25 Hz to 150 Hz sub-bass in the most demanding environments, such as football and soccer fields, baseball stadiums, and amusement parks. Directivity can be omni or cardioid, depending on placement. Using dual 18-inch, 4,000W low-frequency transducers with 4.5-inch voice coils, the S-TL218SS provides minimal distortion and smooth, extended low-frequency response. It is available as a passive system.