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The Thunder-KMT21P is a high-performance passive subwoofer designed with a powerful peak output of 136 dB to provide high-quality audio in the low frequency range for use in mid to large applications. The KMT21P features a 1800 W 21" drive unit with magnet structure and suspension engineered for maximum linear excursion.

The Thunder-KMT21P is ideal for medium throw applications, like theaters, concert halls, and AV installations.

More information about the Thunder line

Unique Performance-to-Size Ratio

Produces an impressive high-power performance by producing a high SPL from a small frame.


Color Customizable

We have the ability to customize your project by color matching your system to any RAL code to help you to better integrate the speakers into a wide variety of venues.



We created a portfolio complete with lightweight products that are easy to transportation and quick to setup optimizing logistics, space, labor costs and time.


Weather Resistant

We utilize the most durable and resistant materials when developing our products to protect and conserve the system regardless of the elements, rendering a K-array installation reliable and long-lasting.



Four-Corner Port Configuration

The unique four-corner port configuration provides symmetrical back loading to the speakers, for extended bass response with very low distortion.


Dante Compatible

With the dedicated K-dante accessory, this solution can be integrated into a Dante network making it interoperable with other devices.




  • Power Handling 1800W (AES)
  • Impedance 4 Ohm
  • Frequency range 30 Hz - 150 Hz ± 3dB (preset dependent)
  • Maximum SPL3 132 dB (cont) - 136 dB (peak)


  • Omni


  • Type External Crossover Required
  • Frequency Low pass @ 150 Hz maximum


  • Type 1 x 21” neodymium speakers with 3” voice coil

Audio Input

  • Connectors 2 x NL4 Speakon
  • Digital Connectors 1+ 1- (signal IN& LINK); 2+ 2-(through)

Physical Overview

  • Dimensions 55.5 x 55.5 x 76.3 cm (21.85” x 21.85” x 30.03”) (1)
  • Weight 44.5 Kg (98.10 lb)
  • Notes for data:

    1. ( W x H x D).

    New materials and design are introduced into existing products without previous notice. Present systems may differ in some respects from those presented in this catalogue.

Customers Applications

Thunder-KMT21P can be successfully used in a range of different settings and events.

Discover all the projects where Thunder-KMT21P products have been used