The SSE 1564 subwoofer is a 2-way bi-amp system comprised of a 15" Pro Rider woofer and a 44XT 4" titanium diaphragm compression driver mounted on a Quadratic Throat Waveguide. The SSE 1564 subwoofer has a rotatable horn section that allows the same cabinet to provide a coverage that is broad in the horizontal or vertical dimension and adjustable by the user. Bi-amp input connection is made via a 4-pin Neutrik in parallel with a terminal strip. The trapezoidal shaped bass speaker enclosure is constructed of 18mm Baltic birch and painted with a durable textured paint. A 16-gauge powder-coated metal grille with poly cloth covering protects the front of the system from damage. Twelve 3/8"-16 threaded mounting suspension points are provided for flying and mounting.