Rumble-KU44 I

The Rumble-KU44 is an extremely compact, arrayable bass element designed to combine with mid-high speakers to provide a full-range frequency response with prodigious output in a virtually invisible profile. This subwoofer has a frequency range of 50 Hz to 150 Hz and is comprised of two 4” neodymium transducers and two 4” passive radiators engineered for maximum linear excursion and minimum residual noise. For easier use and integration with all KA amplifiers, the KU44 allows the user to choose between two different values of impedance, 8/32 Ω. At 32 Ω as many as 8 units can be powered off a single 4Ω amp channel. By recalling the dedicated presets, the K-ARRAY Kommander amplifiers are the best electronics to run any Rumble subwoofer, capable to balance perfectly all the settings you need to match with any mid-high speaker of the K-ARRAY’s catalog. This helps integrators to find their complete solutions in the same range of products.

KU44 is made entirely of steel, making it extremely resistant, even when deployed outside in tough weather conditions. This is ideal for aquatic environment applications where ordinary bass speakers would corrode. On request, the MARINE version features even higher treatments against salt corrosion. 

A variety of dedicated hardware accessories provide integrators with numerous mounting options for permanent and portable installations best suited for retail, restaurants, hotels, bars, museums and other environments where invisible line arrays are ideal. 
Installing a line array of KU44 subwoofers to the side or behind a line array of Kobras creates a full-range sound source with true line array characteristics down to 50 Hz. 

The main product models and codes are:
KU44 I  black model
KU44W I  white model
KU44X I customizable color and finish (box + grille)
new! KU44-2 I, KU44W-2 I, KU44X-2 I  2Ω version
new! KU44M I, KU44MW I, KU44MX I (only RAL colors)  with MARINE TREATMENT (on request)
new! KU44M-2 I, KU44MW-2 I, KU44MX-2 I (only RAL colors)  2Ω version with MARINE TREATMENT (on request) 

All Rumble-KU44 I components are designed by the K-array R&D department and are custom-made under the K-array quality control system in Italy.


Extremely compact subwoofer



  • Type:  

    Passive subwoofer

  • Transducers:  

    2 x 4" neodymium magnet woofers
    2 x 4" passive radiators

  • Frequency Response:  

    45 Hz - 150 / 500 Hz (-6 dB)

  • Max SPL:  

    116 dB (peak)

  • Rated Power:  

    120 W

  • Coverage:  


  • Connectors:  

    4PIN euroblock connector (included)

  • Nominal Impedance:  

    8 Ω / 32 Ω selectable

Handling and Finishes

  • Dimensions (W x H x D):  

    500 x 116 x 100 mm (19.7 x 4.6 x 4.0 in)

  • Weight:  

    5.9 kg (13.0 lb)

  • Material:  

    Stainless Steel

  • Colors:  

    Black, White, Custom RAL

  • Finishes:  

    24K Gold, Polished, Brushed


  • IP Rating:  


  • (1) With dedicated preset
  • (2) Maximum SPL is calculated using a signal with crest factor 4 (12dB) measured at 1 m.
  • (3) Removable rubber feet not included in the measures
  • (4) More complete water protection with K-KUIP4 accessory.
  • Passive loudspeakers requires dedicated preset loaded on board of K-array amplifiers.

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


KU44 Datasheet

Ver. 2.0

KU44 User Guide

Ver. 1.1

KU44 3DS 3D

Ver. 1.0

KU44 Layout

Ver. 1.0


Ver. 5.0

KU44 Architect Specs

Ver. 1.0

Amp-to-Speakers Table

Ver. 2.1

CE Declaration of Conformity


files in Revit

K-WF44 Drilling Jig A1

K-WF44 Drilling Jig A2




Ver. 4.0


Ver. 1.0

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