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L-Acoustics KS28 : High-Power Dual 18" Professional Subwoofer
The L-Acoustics KS28 is the reference high-power subwoofer in the L-Acoustics range, designed for large-scale sound reinforcement applications that demand deep low-frequency extension, high SPL and exceptional dynamics.
Built around two 18-inch neodymium drivers, the KS28 delivers powerful and controlled bass for concerts, festivals, touring productions, arenas, theatres, clubs and large event systems. With a maximum SPL of 143 dB and low-frequency extension down to 25 Hz, it is designed to provide the impact and headroom required for demanding professional audio systems.
Powerful Low-Frequency Performance
The L-Acoustics KS28 combines two 18-inch low-frequency drivers in a bass-reflex enclosure using the brand’s L-Vents laminar venting technology.
L-Vents are designed to reduce turbulence and port noise at high output levels, helping the enclosure maintain clean, powerful low-frequency reproduction even when operating at high SPL.
Key specifications include :
- 2 × 18" neodymium low-frequency drivers
- maximum SPL of 143 dB
- low-frequency limit down to 25 Hz
- standard or cardioid configurations
- bass-reflex enclosure with L-Vents
- nominal impedance of 4 Ω
- net weight of 79 kg
- IP55 rating
- flyable enclosure with integrated rigging system.
These characteristics make the KS28 particularly suitable for systems where low-frequency output must remain powerful, precise and consistent across large audience areas.
Omni and Cardioid Subwoofer Configurations
The KS28 can be deployed in both standard and cardioid configurations, giving sound designers more control over low-frequency directivity.
Cardioid configurations are particularly useful for reducing unwanted low-frequency energy behind the subwoofer array. This can help improve conditions on stage, reduce spill into neighbouring areas and provide better control in acoustically sensitive environments.
This flexibility makes the KS28 suitable for both straightforward ground-stacked systems and more advanced low-frequency array designs.
Amplification and L-Acoustics System Integration
The KS28 is designed as part of the complete L-Acoustics ecosystem rather than as a standalone passive subwoofer.
L-Acoustics specifies the LA12X amplified controller for the KS28, providing amplification, DSP processing, loudspeaker presets and system protection.
The KS28 can therefore be integrated into complete L-Acoustics systems alongside loudspeakers from ranges such as K Series, L Series and A Series, with system design and prediction handled through the wider L-Acoustics workflow.
This integrated approach helps maintain predictable performance from system design through to deployment and operation.
The L-Acoustics Subwoofer Range
The KS28 sits within a broader range of L-Acoustics professional subwoofers, allowing system designers to select the appropriate enclosure according to required output, physical dimensions and application.
Alongside the KS28, the current range includes products such as the KS21, a compact high-power 21-inch subwoofer with low-frequency extension down to 29 Hz, and the SB18, a versatile high-power single 18-inch model.
For more compact systems, L-Acoustics also offers models such as the SB15m, while dedicated installation products include the KS21i, SB18 IIi, SB10i, SB10r, SB6i and SB6r.
At the highest-output end of the current subwoofer portfolio, L-Acoustics also offers the CS1 cardioid subwoofer, complementing the range for applications requiring extremely high low-frequency performance.
This broad portfolio makes it possible to maintain a consistent L-Acoustics system approach across everything from discreet architectural installations to large touring and festival systems.
L-Acoustics KS28 in Belgium and Luxembourg
XLR is the exclusive L-Acoustics distributor for Belgium and Luxembourg.
Our team supports rental companies, integrators, venues, sound engineers, consultants and production professionals with L-Acoustics products and system solutions.
Whether you are considering the KS28, KS21, SB18 or another L-Acoustics subwoofer, XLR can assist you with product selection, system design, technical advice, availability and project support.
Contact XLR for more information about the L-Acoustics KS28, demonstrations or a personalised quotation in Belgium and Luxembourg.