to top


Just like the other subwoofers in the Thunder line, the Thunder-KMT218 is much more than a standard dual 18” powered subwoofer.

This smart sub has an onboard Class D amplifier that delivers 2 x 2000 W at 4Ω with one of the two amplifying channels dedicated to the power supply of the sub while the other is dedicated to a Speakon output to create many different speaker configurations, including single mid-high modules, multiple line arrays, or the passive version of an additional bass module.

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.


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.


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.


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.



Integrated DSP

Built-in DSP allows for fine tuning of every single sonic parameter of the loudspeaker, providing the sound engineer the highest control on overall performance and fine granularity in system configuration.


DSP Image
Dante Compatible

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


Self-Powered Capabilities

Our self-powered solutions prevent distortion from cumbersome and fragile passive crossovers and power loss due to long running cables, and offer plenty of advantages ranging from the compactness of the solution to the ease of integration with new and existing sound systems.


Onboard Touch Screen

An integrated touch screen provides intuitive control over the main DSP functions: input/output levels, signal routing, offset delays for the subwoofer and Speakon output and overall system delay (up to 330 ms).




  • Power Handling 1600W (AES)
  • Max power 2800 W
  • Impedance 4 Ohm
  • Frequency range 30 Hz - 150 Hz ± 3dB (preset relating)
  • SPL 1W/1mt 101 db
  • Maximum SPL3 139 dB (peak)


  • Type Omni


  • Type DSP Controlled
  • Frequency Low pass @ 150 Hz(maximum - preset dependent)


  • Type 2 X 18” neodymium magnet woofer with 3” voice coil

Audio in/out

  • Analog Connectors 2 male + 2 female 3-pin balanced XLR
  • Digital Connectors 1 male + 1 female 3-pin XLR

Remote Control input

  • Connector 1 male + 1 female XLR parallel
  • Connector 1 USB B Jack serial converter


  • Type 1 module Class D - DSP controlled
  • Subwoofer Power Output 2000 W @ 4 Ω 1% THD + NOISE
  • Speakon Power output 2000 W @ 4 Ω 1% THD + NOISE
  • Protections Over Temp.(Power Limiting – Thermal Shutdown), Short Circuit/Overload Output Protection, Power Limiting, Clip Limiter/Permanent Signal Limiter, High Frequency Protection
  • Frequency response 20 Hz – 20 kHz (+0 -1 dB) for 1 W @ 4 Ω
  • Damping factor @ 100 Hz >10000
  • THD+N 1W to Full Power @ 1W 0.2%
  • Thermal dissipation 1/4 of max output power @ 4 Ω @230V = 1123 BTU/h (283 KCal/h) @115V = BTU/h (190 KCal/h)
  • Nominal power requirements 100 - 240 Vac ± 10% 50-60 Hz

AC Power

  • Nominal power requirements 100 - 240 Vac ± 10% 50-60 Hz
  • Operating Range 85 – 265 Vac


  • Power factor (cos 1/8 rated power(pink noise)@ 4Ω) >0.90 @ 4Ω full power


  • IP 20 (IP53 with K-AMPCOVER accessory)


  • Dimensions 94.9 x 48.0 x 60.0 cm (37.36” x 18.89” x 23.62”) (2)
  • Weight 49.0 Kg (108.2 lb)
  • Notes for data:
    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-KMT218 can be successfully used in a range of different settings and events.

Discover all the projects where Thunder-KMT218 products have been used