A passive large-format low-end extension features two high-excursion, direct-radiating 15-inch transducers in a bass-reflex tuned enclosure with laminar vents for enhanced LF efficiency. Constructed from premium Baltic beech and birch plywood, the enclosure is protected by a coated steel grill and acoustically transparent fabric. It includes four ergonomic handles and four-point flush-fitting hardware for rigging and combining with other family loudspeakers. Exclusively driven and protected by a proprietary amplified controller with a dedicated preset.