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K-array KMT21 I


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Product Overview

High-Tech, Multi-Task Powered 21" Subwoofer w/DSP & Power Output

KMT21 is much more than a standard 21” powered subwoofer. The amplifier mounted on board is Class D, delivering 2 x 2000 W at 4 Ohm. 

The unique four-corner port configuration gives symmetrical back loading to the speaker for extended bass response with very low distortion. This also gives incredible structural strength to the cabinet despite its light weight. 

The rear panel provides input for a balanced line signal, a balanced microphone signal with phantom power and digital signals in AES/EBU protocol and also on an XLR for ease of cabling.



  • Fitted with integral handles 
  • Direct radiating, long excursion 21” driver
  • Analog and digital AES-EBU inputs
  • RS485 and USB connectivity for remote control




  • Power handling: 1600 W
  • Frequency range: 30 Hz - 150 Hz. +/- 3dB (preset dependent)
  • Maximum SPL: 130 dB continuous - 136 dB peak



  • Horizontal: Omni
  • Vertical: Omni



  • Type: DSP controlled
  • Frequency: 150 Hz minimum (preset dependent)



  • Full-range: 1 x 21" Neodymium magnet woofer with 4" voice coil



  • Type: 1 module Class D - DSP controlled
  • Power: 2 x 2400 Watt @ 4 Ohm
  • Protection: Dynamic limiter, over current, over temp and short circuits



  • Dimensions: 55.5 x 55.5 x 76.3 cm (21.9" x 21.9" x 30.0")
  • Weight: 49 Kg (108 lbs)

Product Downloads

  • KMT21 I Data Sheet PDF 0.3 MB
  • KMT21 I User Manual PDF 3.5 MB
  • KMT21 I K-Framework 2 User Guide PDF 3.6 MB


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*Prices are in AUD, include GST and are subject to change. Please call National Audio for pricing and availability on the KMT21 I.