Outline SUB218 High Power Ground-Stackable Subwoofer – 2 x 18″

When your event demands chest-thumping, floor-shaking bass that fills arenas and large venues, the Outline SUB218 steps up as the definitive low-frequency solution. This high-power ground-stackable subwoofer combines two long-excursion 18″ woofers with proprietary E.R.P. porting to deliver up to 148.5 dB SPL and response down to 28 Hz, giving modern dance events, live music productions and festival stages the deep, accurate bottom end they need.

Engineered for real-world professional use, the SUB218 turns amplifier power into clean, high-impact output far more efficiently than conventional designs. Its Energy Retentive Porting minimises turbulence and compression, resulting in tighter transients and more usable low-end energy that keeps the dancefloor moving and the audience fully immersed. Whether you’re powering a temporary live rig or a fixed installation in a nightclub or theatre, this sub performs reliably night after night.

Built from robust Baltic birch plywood and finished in durable black polyurea coating, the cabinet shrugs off the rigours of touring while the heavy-duty epoxy-coated steel grille protects the drivers. At 80 kg and measuring 570 × 1070 × 750 mm, it is designed to be stacked directly on the ground or flown using the 16 integrated M8 points, making integration with Outline line arrays or point-source loudspeakers fast and straightforward. Two NL4 connectors simplify wiring in any configuration.

For crews who need serious output without sacrificing control or clarity, the SUB218 earns its place at the heart of any serious audio system. Its quasi-omnidirectional coverage ensures even bass distribution across large areas, while the recommended crossover point up to 120 Hz allows seamless blending with mid-high systems. From corporate galas and outdoor concerts to permanent venue installs, this subwoofer consistently delivers the powerful, articulate low frequencies that make every performance unforgettable.