Thunder-KS3P I

The Thunder-KS3P I is a compact passive subwoofer featuring a long excursion 21” neodimium magnet woofer with 4” voice coil. The Thunder-KS3P 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.


Ultra-light, high power subwoofers



  • Type:  

    Passive subwoofer

  • Transducers:  

    21" neodymium magnet woofer

  • Frequency Response:  

    30 Hz - 150/300 Hz (-6 dB) crossover dependant

  • Crossover:  

    DSP-controlled, Low Pass @ 150 Hz, preset dependant

  • Max SPL:  

    139 dB

  • Rated Power:  

    2800W peak

  • Coverage:  


  • Connectors:  

    2 x SpeaOn NL4

  • Nominal Impedance:  


Handling and Finishes

  • Dimensions (W x H x D):  

    735 x 580 x 700 mm 
    (28.9 x 22.83 x 27.55 in)

  • Weight:  

    49,2 kg (108.5 lb)

  • Material:  

    Polyurea coated birch plywood

  • Colors:  

    Black/White/Custom RAL


  • IP Rating:  


  • (1) With dedicated preset
  • (2) Maximum SPL is calculated using a signal with crest factor 4 (12dB) measured at 1 m.
  • (3) Included 17 mm (0.7 in) removable rubber feet
  • (4) In case of permament, long lasting installation in critical environments (swimming pools, beaches, yachts..), we recommend to further protect the subwoofer. Contact K-array directly to discuss best protection practices.
  • Passive loudspeakers requires dedicated preset loaded on board of K-array amplifiers.

  • New materials and design are introduced into existing products without previous notice.

Dante Ready
Dante Ready

K-array's Dante Ready, a licensing program by Audinate.

Download the Dante Controller for free!


Thunder-KS3P l Datasheet

ver 0.2

CE Declaration of Conformity

Amp-to-speaker matching table

Thunder KS User Manual

KS MK1 Subwoofer Quick Guide


KS3P Layout

KFramework3 v3.0.0 Windows

Ver. 3.0.0

KFramework3 v3.0.0 Osx

Ver. 3.0.0

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