The L-Acoustics KS28 is a high-power subwoofer designed to extend the low-frequency response of large-format sound systems. It features two 18" neodymium cone drivers housed in a bass-reflex enclosure equipped with L-Vents™ technology, which minimizes turbulence and port noise while enhancing low-frequency efficiency. Operating down to 25 Hz, the KS28 delivers a maximum SPL of 143 dB, ensuring powerful and clear bass reproduction. It offers flexible directivity options, supporting both standard and cardioid configurations to suit various deployment needs. The subwoofer is powered by the LA12X amplified controller, which provides advanced crossover functions, linearization, and protection for the transducers. Constructed from premium-grade Baltic birch plywood, the KS28 is both durable and relatively lightweight, weighing 79 kg (174 lb). Its versatile design allows for stacking in horizontal or vertical orientations and flying in arrays of up to 16 units, making it suitable for a wide range of live sound applications.