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Thunder-KS4P l

Thunder-KS4P l

The Thunder-KS4P I is a passive subwoofer featuring 2x long excursion 18” neodimium magnet woofer with 3” voice coil.

The Thunder-KS4P I features 2x SpeakON NL4 connectors that allow to input the signals from external active systems or amplifiers, with either a 2-wire or a 4-wire cable, as well as route the signal to other loudspeakers.

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.


Crafted For Heavy Touring

The Thunder Series subs are built with a choice of Finnish birch plywood so it isn’t heavy and cumbersome but it is incredibly resistant, making it a desired speaker for audio rentals.


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.




  • Type Passive subwoofer
  • Transducers 2 x 18” neodymium magnet woofer
  • Frequency Response 35 Hz – 150/300 Hz (-6 dB) crossover dependant
  • Crossover DSP-controlled, Low Pass @ 150 Hz, preset dependant
  • Max SPL 141dB
  • Rated Power 2800W peak
  • Coverage Omni
  • Connectors 2 x Speakon NL4
  • Nominal Impedance 4ohm

Handling and Finishes

  • Dimensions (W x H x D) 1106 x 500 x 580 mm (43.5 x 19.7 x 22.8 in)
  • Weight 53,2 kg (117.3 lb)
  • Material Polyurea coated birch plywood
  • Color Black, White, Custom RAL
  • IP Rating 54