The L-Acoustics KS28 Subwoofer is a pinnacle reference subwoofer engineered for large-scale sound systems, delivering unmatched low-frequency power and control. The KS28 houses two high-excursion 18″ direct-radiating transducers, mounted in a carefully tuned bass-reflex enclosure to achieve deep, articulate performance.

A key innovation is the L-Vents laminar port design, which dramatically reduces turbulence and port noise at high output levels—ensuring cleaner, higher-efficiency LF performance even under extreme conditions. The KS28 boasts a –10 dB low-frequency extension down to 25 Hz, giving it the reach needed for cinematic bass pressure and integrity in demanding live environments. Its peak SPL reaches approximately 143 dB, enabling the KS28 to drive vast spaces with authority and clarity

Flexibility is built in: the KS28 can be deployed in standard or cardioid directivity modes, allowing engineers to sculpt coverage and suppress rear-facing energy where needed. Mechanically, it’s crafted from premium birch and beech plywood with optimized thickness and internal stiffening to provide structural integrity while minimizing weight (174 lb). It includes six ergonomic handles, as well as ground and side runners for safe stacking, plus a flush-mount two-point rigging system for flown configurations.

The KS28 is designed to pair seamlessly with the LA12X amplified controller, which provides advanced crossover, linearization, L-Drive protection, and preset support (standard or cardioid, with multiple low-pass options) to match a variety of coupling and contouring needs. With IP55 weatherization and a robust build, the KS28 is ready for the rigors of touring, festival, and outdoor deployment.

Whether stacked or flown, the L-Acoustics KS28 Subwoofer stands as a formidable low-end foundation—powerful, responsive, and engineered for professional, large-format audio systems.