L-Acoustics KS28 & LA12X Package

The L-Acoustics KS28 subwoofer is designed to extend the frequency response of large format systems in stacked or flown deployments. A cornerstone of the K-Series family, it pairs with K1/K1-SB, K2/K1-SB and ARCS II line sources, delivering a measured +3 dB SPL advantage over the previous generation SB28. It is also the first L-Acoustics enclosure built to fully utilize the power of the LA12X amplified controller, bringing advanced crossover functions, linearization and L-Drive transducer protection to the lowest end of the system. The L-Acoustics KS28 offers standard or cardioid directivity, selected through physical deployment and the suitable preset, allowing it to significantly boost LF extension and contour for festivals, arenas and large touring productions.

Performance is built around two high excursion, 18-inch neodymium transducers with aluminium die cast baskets, mounted in a bass-reflex tuned enclosure fitted with L-Vents laminar vented ports. These flared-profile ports reduce turbulence and port noise at high levels while increasing LF efficiency. The KS28 operates from a -10 dB low frequency limit of 25 Hz and reaches a maximum SPL of 143 dB, with the transducer excursion capability and laminar airflow working together to deliver high level output with low distortion. The enclosure presents a 4 ohm nominal impedance and accepts signal through a 4-point speakON connector. Driven by the LA12X, which provides 4 x 2600 W per channel into 4 ohms in a 4 input x 4 output architecture, each amplified controller can serve up to four enclosures. The onboard library includes standard and cardioid presets, each available with two low-pass filters to accommodate various coupling conditions and LF contour requirements.

The cabinet is assembled from premium grade beech and birch plywood panels optimized for thickness, with stiffeners that maximize internal volume and mechanical integrity while keeping net weight at 79 kg (174 lbs). The front carries a steel grill with anti-corrosion coating over acoustically neutral 3D fabric, finished in dark grey brown PANTONE 426C. Six ergonomic handles allow solid grip handling, two ground runners and eight side runners ensure safe stacking, and a flush-mounted two-point suspension system in high grade steel makes flying quick and captive. Weatherized to an IP55 rating for outdoor operations, the KS28 measures 1351 mm x 702 mm x 719 mm (53.2 in x 27.6 in x 28.3 in). It stacks horizontally or vertically in standard or cardioid arrangements, flies in vertical arrays of up to 16 units on the KS28-BUMP, and moves easily with the KS28-PLA front dolly or the KS28-CHARIOT chariot for up to four units. Available now and ready to ship.