The SW-218 is a dedicated LF / subwoofer system in a rectangular, horizontal, computer optimized enclosure. Loudspeaker compliment consists of a twin 18" LF woofers separately loaded into individual, vented sub-enclusures. The entire enclosure is constructed of durable 13-ply void-free birch laminate, dadoed for strength and durability. Binding posts are located on a recessed steel jackpanel on the back side of the enclosure. Perforated steel is employed for frontal protection of the loudspeaker compliment.