The SA18 was designed as multi-purpose, dedicated LF system for small to medium scale sound reinforcement. The SA18 offers high quality bass and sub-bass output in a manageable, durable enclosure. The SA18 can be combined with SA10-1 or SA12-1, by stacking or use of the polemount adaptor, to create a high impact, scalable 3-way P.A. system. This system also integrates easily with other McCauley SA(tm) products, offering consistent coverage and a uniform appearance. The SA18 is a dedicated LF / subwoofer system in a trapezoidal, computer optimized enclosure. Loud speaker complement consists of a single 18” LF woofer in a vented chamber. The enclosure is constructed of durable 12-ply void-free birch laminate, dadoed for strength and durability. Handles are balance-optimized to faciliate transportation. A standard tripod / polemount adaptor is included. Perforated steel is employed for frontal protection of the loud speaker complement.