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