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The KSC18P is a passive 18-inch subwoofer specifically designed for cinema and theater applications, where LF contour reinforcement and sound effects ask for impact and deep bass.

The KSC18P implements a single 18” high excursion woofer in a compact bass-reflex enclosure, acoustically optimized for operating at high SPL in very demanding conditions.

The small footprint and the extended low-end response makes this subwoofer the perfect companion in Cinemas, Theaters and Home Entertainment environments.

More information about the Thunder 2022 line

Find That Deeper Bass

Are you looking for a deeper sound, higher sound pressure and better tonal definition? A new design approach with the KS versions further extends the sound reproduction in the low frequency and promises a significant increase in SPL performance.


Giving You Ultimate Sound Control

Simply combining two or more subwoofers to obtain a configuration that guarantees cardioid diffusion even throughout the low frequencies promises to give you a cleaner sound on stage, minimise risk of acoustic feedback, and in general a greater control over sound design the way you want it.


Adaptable, Even Off The Stage

Thanks to K-array’s signature compact style, without trying to be defined as a design product the Thunder series can easily adapt to architectural installations or even wedding events in the open air where blending in is of great importance, also thanks to the possibility of a custom painting on demand.


Obsession For Details

The details can really make the difference, the side handles are elegantly integrated into the speaker body beautifully crafted for comfort.


Extended Line Array

Among the Thunder-KS accessories, one of particular importance are the mechanics for hanging in arrays which allow it to be suspended in combination with the line array speakers of the Mugello family, and in clusters composed exclusively of subwoofers.


1 X 4

In their active version, the Thunders are more than just subwoofers. They include a powerful 4-ch class D amplifiers fully managed by sophisticated integrated DSP processors.


Embrace New Skills

The new Thunder-KS integrates a new generation intelligence software (osKar) that allows you to manage the entire ecosystem through various control platforms and offers various features directly on board the device, in order to simplify its use and extend its application possibilities.


Updated Control Softwares

The remote control of Thunder-KS subwoofers can take place through three different types of software released for free, starting from the most complete K-framework for Windows and Mac, passing from a more intuitive web app and arriving at the more simplified mobile app (Wi-Fi).


Quiet, Even If It Rains!

With a particular focus on audio technicians and rentals, the amplifier of the new Thunder-KS line features a PowerCon True connector for powering the mains, allowing easier wiring extension and greater resistance to bad weather.




  • Type Passive subwoofer
  • Transducers 18” neodymium magnet with 4.5” voice coil
  • Frequency Response 15 Hz – 150 Hz (-6 dB)
  • Crossover DSP-controlled, preset dependant
  • Max SPL 134dBb (peak)
  • Rated Power 3600W
  • Coverage Omni
  • Connectors SpeakOn NL4
  • Nominal Impedance 4 Ω

Handling and Finishes

  • Dimensions (W x H x D) 1100 x 700 x 380 mm (43.3 x 27.6 x 15 in)
  • Weight 53 kg (116,85 lb)
  • Material Wood
  • Color Black
  • IP Rating IP40