From the Manufacturer
A dedicated subwoofer system with an 18-in transducer in a vented trapezoidal enclosure. APPLICATIONS The SB330e is engineered to complement the KF300e in small format arrays. Tuned enclosure venting extends LF response and minimizes driver strain. MX Series processors extend LF response and safeguard against cone excursion damage. Universal suspension hardware includes both a flytrack and a 3/ 8″-16 mounting point to support portable or permanent applications. Six Year Warranty.