The SB330zF is a high output, mid-size sub-woofer system. This versatile, all-purpose sub-woofer is designed for portable use where the fatter-sounding output of an 18 inch driver is desired. The SB330zF is engineered to complement the KF300z Series in small format arrays, but it also works well with any full-range loudspeaker. Its applications include: band/club PA, small houses of worship, small auditoriums/theaters, A/V systems, hotel ballrooms, cruise ships, small dance clubs, DJ monitoring, and drum-fill monitoring.