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The Mastiff-KM312 is the largest self-powered monitor in the Mastiff line. Powering at a max of 4000 W, this aggressive speaker features three 12” woofers and produces a maximum SPL output at 136 dB (peak).

More information about the Mastiff line


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.



Selectable Coverage

The directivity of many K-array solutions can be modified in order to optimize the coverage by an adjustable horn with variable orientation.


Spot/Flood Dragon
Onboard Touch Screen

An integrated touch screen provides intuitive control over the main DSP functions, from signal routing to level and delay settings.


Dante Compatible

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


Full-Range Frequency Response

With a very extended frequency range the loudspeaker covers the entire audible spectrum without the need for a subwoofer ideal for when there are space constraints.


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.




  • Type Active subwoofer
  • Transducers 1 x Coaxial 12" woofer with 2.4" compression driver
  • . 2 x 12" neodymium magnet woofer
  • Frequency Response (1) 60 Hz – 19 kHz (-6 dB)
  • Maximum SPL (2) 138 dB (peak)
  • Coverage Selectable: V/H – 30°/100° | 100°/30°
  • Connectors INPUT: 2x XLR (bal) line input, 1x XLR AES3 input
  • . OUTPUT: 1x speakOn loudspeaker output + 2x XLR (bal) parallel line output, 1x XLR AES3 output
  • . SERIAL: 1x XLR RS485 serial input, 1x XLR RS485 serial output, 1x USB-B inlet

Handling and Finishes

  • Dimensions (W x H x D) (3) 820 x 352 x 530 mm (32.3 x 13.8 x 20.9 in)
  • Weight 37,5 kg (82.67 lb)
  • Material Wood/Stainless Steel
  • Color Black, White, Custom RAL


  • Type 4 ch. switch-mode, class D
  • Output power 4 x 1600 W @ 4 Ω
  • Power consumption 600 W, 1/8 Rated Power (Pink Noise)


  • IP Rating IP20
  • Notes for data:
    (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

    Passive loudspeakers require dedicated presets loaded on K-array amplifiers.
    New materials and designs are introduced into existing products without previous notice.

Customers Applications

Mastiff-KM312 can be successfully used in a range of different settings and events.

Discover all the projects where Mastiff-KM312 products have been used