SB28 is subwoofer companion for the K1, KUDO, V-DOSC and ARCS systems, lowering the combined system operating range down to 25Hz. It contains two 18-inch direct radiating LF transducers integrated into a bass-reflex tuned enclosure. The specially designed 18-inch transducers provide an exceptional cone excursion capability combined with low thermal compression even at the very highest operating levels.