A passive subwoofer features a high-movement, 21-inch direct-emission transducer set within a bass-reflex cabinet enhanced with streamlined vents for optimal low-frequency performance. Crafted from the finest Baltic beech and birch plywood, the cabinet ensures durability. A protective steel grill, coated for added resilience, and a sound-permeable fabric shield the transducer. Built-in ergonomic handles and protective corner bumpers are designed for ease of handling and added safety. Its unique built-in rigging hardware ensures seamless integration with other compatible speakers. Specialized rigging tools facilitate both flying and stacking setups. Linking two or more units with the right presets allows for a choice between omnidirectional or cardioid sound dispersion patterns. For optimal performance, it is designed to be powered and safeguarded exclusively by a specific amplified controller using a dedicated preset.