The SB products are Dynatech's premium subwoofers designed for the most demanding professional applications. Abroad range of capabilities and sizes provide the designer with selections that can be specifically matched to their application. Top quality drivers, engineered by Dynatech, provide the highest output and best sonic performance possible for a given form factor. All SB models are reflex, with optimally tuned, vented enclosures. SB subwoofers are the choice where the best sonic performance, highest reliability, and most robust physical construction are required. The legendary SB-218 is a high output, large-format subwoofer system with proven performance in complementing high efficiency, full-range loudspeakers. It is designed for portable use where the fatter-sounding output of dual 18 inch drivers is desired. The SB-218’s driver mounting maximizes cone area and minimizes frontal area, providing the acoustical performance and physical configuration well suited for creating large subwoofer arrays. Its applications include: concert touring, arenas, band/club PA, large houses of worship, large auditoriums/theaters, stage/performer monitoring, drum fill monitoring, and large dance clubs. The SB-218 is designed to be used with today's sophisticated digital signal processing to optimize the LF response.